diff --git a/lib/interface/cli/commands/root/assign.cmd.js b/lib/interface/cli/commands/root/assign.cmd.js
new file mode 100644
index 000000000..8b46da64a
--- /dev/null
+++ b/lib/interface/cli/commands/root/assign.cmd.js
@@ -0,0 +1,18 @@
+const Command = require('../../Command');
+
+const assign = new Command({
+    root: true,
+    command: 'assign',
+    description: 'Assign a resource',
+    usage: 'codefresh assign --help',
+    webDocs: {
+        title: 'Assign',
+        weight: 70,
+    },
+    builder: (yargs) => {
+        return yargs
+            .demandCommand(1, 'You need at least one command before moving on');
+    },
+});
+
+module.exports = assign;
diff --git a/lib/interface/cli/commands/root/unassign.cmd.js b/lib/interface/cli/commands/root/unassign.cmd.js
new file mode 100644
index 000000000..a66f45f00
--- /dev/null
+++ b/lib/interface/cli/commands/root/unassign.cmd.js
@@ -0,0 +1,18 @@
+const Command = require('../../Command');
+
+const unassign = new Command({
+    root: true,
+    command: 'unassign',
+    description: 'Unassign a resource',
+    usage: 'codefresh assign --help',
+    webDocs: {
+        title: 'Unassign',
+        weight: 70,
+    },
+    builder: (yargs) => {
+        return yargs
+            .demandCommand(1, 'You need at least one command before moving on');
+    },
+});
+
+module.exports = unassign;
diff --git a/lib/interface/cli/commands/systemRuntimeEnvironments/apply.cmd.js b/lib/interface/cli/commands/systemRuntimeEnvironments/apply.cmd.js
index 0d399604d..20e7412fc 100644
--- a/lib/interface/cli/commands/systemRuntimeEnvironments/apply.cmd.js
+++ b/lib/interface/cli/commands/systemRuntimeEnvironments/apply.cmd.js
@@ -4,6 +4,7 @@ const _ = require('lodash');
 const applyRoot = require('../root/apply.cmd');
 const { crudFilenameOption } = require('../../helpers/general');
 const sysRe = require('../../helpers/sys-re');
+const { sdk } = require('../../../../logic');
 
 
 const command = new Command({
@@ -38,6 +39,18 @@ const command = new Command({
                 alias: 'd',
                 describe: 'Description of the new runtime environment',
             })
+            .option('assign-accounts', {
+                alias: 'a',
+                type: Boolean,
+                // default: false,
+                describe: 'Assign runtime environment to accounts specified in the yaml',
+            })
+            .option('unassign-accounts', {
+                alias: 'u',
+                type: Boolean,
+                // default: false,
+                describe: 'Unassign runtime environment from accounts based on diff with current state',
+            })
             .example('codefresh patch system-runtime-environments -f ./re.yml', 'Apply changes to a system runtime environment');
     },
     handler: async (argv) => {
@@ -60,6 +73,37 @@ const command = new Command({
         } else {
             await sysRe.update(options, body);
             console.log(`Runtime-Environment: '${options.name}' patched.`);
+            const yamlAccounts = body.accounts;
+            if (yamlAccounts) {
+                if (argv.unassignAccounts) {
+                    const re = await sysRe.get({ ...options, extend: false });
+                    const accounts = _.difference(re.accounts, yamlAccounts);
+                    if (!_.isEmpty(accounts)) {
+                        await sdk.onPrem.runtimeEnvs.account.delete({ name: options.name }, { accounts });
+                        console.log(`Runtime-Environment unassigned from accounts: ${accounts}`);
+                    } else {
+                        console.log('No accounts to unassign');
+                    }
+                }
+
+                if (argv.assignAccounts) {
+                    const re = await sysRe.get({ ...options, extend: false });
+                    const accounts = _.difference(yamlAccounts, re.accounts);
+                    const existing = await sdk.accounts.listAccounts({ _id: accounts });
+                    const nonExisting = _.difference(accounts, existing.map(({id}) => id));
+                    if (!_.isEmpty(nonExisting)) {
+                        throw new CFError({
+                            message: `Accounts do not exist: ${nonExisting}`,
+                        });
+                    }
+                    if (!_.isEmpty(accounts)) {
+                        await sdk.onPrem.runtimeEnvs.account.modify({ name: options.name }, { accounts });
+                        console.log(`Runtime-Environment assigned to accounts: ${accounts}`);
+                    } else {
+                        console.log('No accounts to assign');
+                    }
+                }
+            }
         }
     },
 });
diff --git a/lib/interface/cli/commands/systemRuntimeEnvironments/assign.cmd.js b/lib/interface/cli/commands/systemRuntimeEnvironments/assign.cmd.js
new file mode 100644
index 000000000..e5a3a53de
--- /dev/null
+++ b/lib/interface/cli/commands/systemRuntimeEnvironments/assign.cmd.js
@@ -0,0 +1,51 @@
+const CFError = require('cf-errors');
+const _ = require('lodash');
+const Command = require('../../Command');
+const assignRoot = require('../root/assign.cmd');
+const { crudFilenameOption } = require('../../helpers/general');
+const { sdk } = require('../../../../logic');
+
+const command = new Command({
+    command: 'system-runtime-environments <name> <accounts..>',
+    aliases: ['sys-re', 'system-runtime-environment'],
+    parent: assignRoot,
+    description: 'Assign system-runtime-environments to accounts',
+    onPremCommand: true,
+    usage: 'Use assign to add runtime environments to accounts by their name or id',
+    webDocs: {
+        title: 'Assign System Runtime-Environments',
+        weight: 90,
+    },
+    builder: (yargs) => {
+        crudFilenameOption(yargs);
+        return yargs
+            .positional('name', {
+                describe: 'Runtime environments name',
+                required: true,
+            })
+            .positional('accounts', {
+                describe: 'Accounts names',
+                type: Array,
+                required: true,
+            })
+            .example(
+                'codefresh assign sys-re my-sys-re acc1 acc2',
+                'Add system runtime enviroment "my-sys-re" to accounts acc1 and acc2'   ,
+            );
+    },
+    handler: async (argv) => {
+        const { name, accounts: accountsNames } = argv;
+        const accounts = await sdk.accounts.listAccounts({ name: accountsNames });
+        const nonExistentAccounts = _.difference(accountsNames, accounts.map((a) => a.name));
+        if (!_.isEmpty(nonExistentAccounts)) {
+            throw new CFError({
+                message: `Accounts do not exist: ${nonExistentAccounts}`,
+            });
+        }
+        const accountIds = accounts.map((a) => a.id);
+        await sdk.onPrem.runtimeEnvs.account.modify({ name }, { accounts: accountIds });
+        console.log(`Successfully assigned "${name}" to accounts: ${accountsNames}`);
+    },
+});
+
+module.exports = command;
diff --git a/lib/interface/cli/commands/systemRuntimeEnvironments/unassign.cmd.js b/lib/interface/cli/commands/systemRuntimeEnvironments/unassign.cmd.js
new file mode 100644
index 000000000..2fb12a1c1
--- /dev/null
+++ b/lib/interface/cli/commands/systemRuntimeEnvironments/unassign.cmd.js
@@ -0,0 +1,51 @@
+const CFError = require('cf-errors');
+const _ = require('lodash');
+const Command = require('../../Command');
+const unassignRoot = require('../root/unassign.cmd');
+const { crudFilenameOption } = require('../../helpers/general');
+const { sdk } = require('../../../../logic');
+
+const command = new Command({
+    command: 'system-runtime-environments <name> <accounts..>',
+    aliases: ['sys-re', 'system-runtime-environment'],
+    parent: unassignRoot,
+    description: 'Unassign system-runtime-environments from accounts',
+    onPremCommand: true,
+    usage: 'Use unassign to remove runtime environments from accounts by their name or id',
+    webDocs: {
+        title: 'Unassign System Runtime-Environments',
+        weight: 90,
+    },
+    builder: (yargs) => {
+        crudFilenameOption(yargs);
+        return yargs
+            .positional('name', {
+                describe: 'Runtime environment name',
+                required: true,
+            })
+            .positional('accounts', {
+                describe: 'Accounts names',
+                type: Array,
+                required: true,
+            })
+            .example(
+                'codefresh unassign sys-re my-sys-re acc1 acc2',
+                'Remove system runtime enviroment "my-sys-re" from accounts acc1 and acc2',
+            );
+    },
+    handler: async (argv) => {
+        const { name, accounts: accountsNames } = argv;
+        const accounts = await sdk.accounts.listAccounts({ name: accountsNames });
+        const nonExistentAccounts = _.difference(accountsNames, accounts.map((a) => a.name));
+        if (!_.isEmpty(nonExistentAccounts)) {
+            throw new CFError({
+                message: `Accounts do not exist: ${nonExistentAccounts}`,
+            });
+        }
+        const accountIds = accounts.map((a) => a.id);
+        await sdk.onPrem.runtimeEnvs.account.delete({ name }, { accounts: accountIds });
+        console.log(`Successfully removed "${name}" from accounts: ${accountsNames}`);
+    },
+});
+
+module.exports = command;
diff --git a/openapi.json b/openapi.json
index 026442f1e..d3932dac6 100644
--- a/openapi.json
+++ b/openapi.json
@@ -1036,7 +1036,30 @@
         "description": "get all the accounts in the system",
         "operationId": "accounts-list-accounts",
         "summary": "List accounts",
-        "parameters": [],
+        "parameters": [
+          {
+            "name": "name",
+            "in": "query",
+            "required": false,
+            "schema": {
+              "type": "array",
+              "items": {
+                "type": "string"
+              }
+            }
+          },
+          {
+            "name": "_id",
+            "in": "query",
+            "required": false,
+            "schema": {
+              "type": "array",
+              "items": {
+                "type": "string"
+              }
+            }
+          }
+        ],
         "x-sdk-interface": "accounts.listAccounts"
       },
       "post": {
@@ -1318,6 +1341,82 @@
         "x-sdk-interface": "onPrem.runtimeEnvs.account.list"
       }
     },
+    "/admin/runtime-environments/account/modify/{name}": {
+      "put": {
+        "x-action": "addRuntimeEnvToAccountByAdmin",
+        "x-entityId": {
+          "pathName": "params.name"
+        },
+        "requestBody": {
+          "content": {
+            "application/json": {
+              "schema": {
+                "type": "object"
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "$ref": "#/components/responses/Json"
+          }
+        },
+        "tags": [
+          "onPrem.runtimeEnvs.account"
+        ],
+        "operationId": "onPrem-runtimeEnvs-account-modify",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "name",
+            "schema": {
+              "type": "string"
+            },
+            "required": true,
+            "description": "Runtime environment name"
+          }
+        ],
+        "summary": "Add to account",
+        "x-sdk-interface": "onPrem.runtimeEnvs.account.modify"
+      },
+      "delete": {
+        "x-action": "removeRuntimeEnvFromAccountByAdmin",
+        "x-entityId": {
+          "pathName": "params.name"
+        },
+        "requestBody": {
+          "content": {
+            "application/json": {
+              "schema": {
+                "type": "object"
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "$ref": "#/components/responses/Json"
+          }
+        },
+        "tags": [
+          "onPrem.runtimeEnvs.account"
+        ],
+        "operationId": "onPrem-runtimeEnvs-account-delete",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "name",
+            "schema": {
+              "type": "string"
+            },
+            "required": true,
+            "description": "Runtime environment name"
+          }
+        ],
+        "summary": "Delete for account",
+        "x-sdk-interface": "onPrem.runtimeEnvs.account.delete"
+      }
+    },
     "/admin/runtime-environments/default/{plan}/{name}": {
       "put": {
         "responses": {
@@ -8408,6 +8507,18 @@
     }
   },
   "components": {
+    "responses": {
+      "Json": {
+        "content": {
+          "application/json": {
+            "schema": {
+              "$ref": "#/components/schemas/Json"
+            }
+          }
+        },
+        "description": "json"
+      }
+    },
     "parameters": {
       "accountName": {
         "in": "path",
@@ -8523,6 +8634,9 @@
             }
           }
         }
+      },
+      "Json": {
+        "type": "object"
       }
     },
     "requestBodies": {
@@ -8669,7 +8783,7 @@
         "content": {
           "application/json": {
             "schema": {
-              "$ref": "#/components/schemas/requestBody"
+              "$ref": "#/components/schemas/Json"
             }
           }
         }
diff --git a/package.json b/package.json
index f7abfbe49..2e5619d66 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "codefresh",
-  "version": "0.86.0",
+  "version": "0.87.0",
   "description": "Codefresh command line utility",
   "main": "index.js",
   "preferGlobal": true,
@@ -115,4 +115,4 @@
       "./test-setup.js"
     ]
   }
-}
\ No newline at end of file
+}