diff --git a/packages/twenty-sdk/src/cli/commands/dev/add.ts b/packages/twenty-sdk/src/cli/commands/dev/add.ts
index 2842477e71..f4da9982a0 100644
--- a/packages/twenty-sdk/src/cli/commands/dev/add.ts
+++ b/packages/twenty-sdk/src/cli/commands/dev/add.ts
@@ -3,7 +3,12 @@ import inquirer from 'inquirer';
 import { writeFile } from 'node:fs/promises';
 import { join, relative } from 'path';
 import { SyncableEntity } from 'twenty-shared/application';
-import { FieldMetadataType, ViewType } from 'twenty-shared/types';
+import {
+  FieldMetadataType,
+  RelationOnDeleteAction,
+  RelationType,
+  ViewType,
+} from 'twenty-shared/types';
 import { assertUnreachable } from 'twenty-shared/utils';
 import { v4 } from 'uuid';
 
@@ -559,12 +564,20 @@ export class EntityAddCommand {
   }
 
   private async getFieldData() {
+    const isRelationFieldType = (type: FieldMetadataType | undefined) =>
+      type === FieldMetadataType.RELATION ||
+      type === FieldMetadataType.MORPH_RELATION;
+
     return inquirer.prompt<{
       name: string;
       label: string;
       type: FieldMetadataType;
       objectUniversalIdentifier: string;
       description: string;
+      relationTargetObjectMetadataUniversalIdentifier?: string;
+      relationTargetFieldMetadataUniversalIdentifier?: string;
+      relationType?: RelationType;
+      onDelete?: RelationOnDeleteAction;
     }>([
       {
         type: 'input',
@@ -618,6 +631,50 @@ export class EntityAddCommand {
         message: 'Enter a description for your field (optional):',
         default: '',
       },
+      {
+        type: 'input',
+        name: 'relationTargetObjectMetadataUniversalIdentifier',
+        message:
+          'Enter the universalIdentifier of the target object of the relation:',
+        default: 'fill-later',
+        when: (answers) => isRelationFieldType(answers.type),
+        validate: (input: string) => {
+          if (!input || input.trim().length === 0) {
+            return 'Please enter a non empty string';
+          }
+          return true;
+        },
+      },
+      {
+        type: 'input',
+        name: 'relationTargetFieldMetadataUniversalIdentifier',
+        message:
+          'Enter the universalIdentifier of the target field on the related object:',
+        default: 'fill-later',
+        when: (answers) => isRelationFieldType(answers.type),
+        validate: (input: string) => {
+          if (!input || input.trim().length === 0) {
+            return 'Please enter a non empty string';
+          }
+          return true;
+        },
+      },
+      {
+        type: 'select',
+        name: 'relationType',
+        message: 'Select the relation type:',
+        choices: Object.values(RelationType),
+        default: RelationType.ONE_TO_MANY,
+        when: (answers) => isRelationFieldType(answers.type),
+      },
+      {
+        type: 'select',
+        name: 'onDelete',
+        message: 'Select the onDelete behavior:',
+        choices: Object.values(RelationOnDeleteAction),
+        default: RelationOnDeleteAction.CASCADE,
+        when: (answers) => isRelationFieldType(answers.type),
+      },
     ]);
   }
 
diff --git a/packages/twenty-sdk/src/cli/utilities/entity/__tests__/get-field-base-file.spec.ts b/packages/twenty-sdk/src/cli/utilities/entity/__tests__/get-field-base-file.spec.ts
index 76d34d7c00..02e27a2b93 100644
--- a/packages/twenty-sdk/src/cli/utilities/entity/__tests__/get-field-base-file.spec.ts
+++ b/packages/twenty-sdk/src/cli/utilities/entity/__tests__/get-field-base-file.spec.ts
@@ -97,4 +97,99 @@ describe('getFieldBaseFile', () => {
     expect(uuid2).toBeDefined();
     expect(uuid1).not.toBe(uuid2);
   });
+
+  it('should render relation properties for a RELATION field', () => {
+    const result = getFieldBaseFile({
+      data: {
+        name: 'company',
+        label: 'Company',
+        type: 'RELATION' as any,
+        objectUniversalIdentifier: 'obj-1',
+        relationTargetObjectMetadataUniversalIdentifier: 'target-obj',
+        relationTargetFieldMetadataUniversalIdentifier: 'target-field',
+        relationType: 'ONE_TO_MANY' as any,
+      },
+      name: 'company',
+    });
+
+    expect(result).toContain(
+      "import { defineField, FieldType, RelationType } from 'twenty-sdk/define';",
+    );
+    expect(result).toContain('type: FieldType.RELATION');
+    expect(result).toContain(
+      "relationTargetObjectMetadataUniversalIdentifier: 'target-obj'",
+    );
+    expect(result).toContain(
+      "relationTargetFieldMetadataUniversalIdentifier: 'target-field'",
+    );
+    expect(result).toContain(
+      'universalSettings: { relationType: RelationType.ONE_TO_MANY }',
+    );
+    expect(result).not.toContain('morphId');
+  });
+
+  it('should include onDelete when provided for a RELATION field', () => {
+    const result = getFieldBaseFile({
+      data: {
+        name: 'company',
+        label: 'Company',
+        type: 'RELATION' as any,
+        objectUniversalIdentifier: 'obj-1',
+        relationTargetObjectMetadataUniversalIdentifier: 'target-obj',
+        relationTargetFieldMetadataUniversalIdentifier: 'target-field',
+        relationType: 'ONE_TO_MANY' as any,
+        onDelete: 'CASCADE' as any,
+      },
+      name: 'company',
+    });
+
+    expect(result).toContain(
+      "import { defineField, FieldType, RelationType, OnDeleteAction } from 'twenty-sdk/define';",
+    );
+    expect(result).toContain(
+      'universalSettings: { relationType: RelationType.ONE_TO_MANY, onDelete: OnDeleteAction.CASCADE }',
+    );
+  });
+
+  it('should omit onDelete when set to None for a RELATION field', () => {
+    const result = getFieldBaseFile({
+      data: {
+        name: 'company',
+        label: 'Company',
+        type: 'RELATION' as any,
+        objectUniversalIdentifier: 'obj-1',
+        relationTargetObjectMetadataUniversalIdentifier: 'target-obj',
+        relationTargetFieldMetadataUniversalIdentifier: 'target-field',
+        relationType: 'ONE_TO_MANY' as any,
+        onDelete: 'None',
+      },
+      name: 'company',
+    });
+
+    expect(result).not.toContain('onDelete');
+    expect(result).not.toContain('OnDeleteAction');
+  });
+
+  it('should render a generated morphId for a MORPH_RELATION field', () => {
+    const result = getFieldBaseFile({
+      data: {
+        name: 'target',
+        label: 'Target',
+        type: 'MORPH_RELATION' as any,
+        objectUniversalIdentifier: 'obj-1',
+        relationTargetObjectMetadataUniversalIdentifier: 'target-obj',
+        relationTargetFieldMetadataUniversalIdentifier: 'target-field',
+        relationType: 'MANY_TO_ONE' as any,
+      },
+      name: 'target',
+    });
+
+    expect(result).toContain('type: FieldType.MORPH_RELATION');
+    expect(result).toMatch(
+      /morphId: '[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}'/,
+    );
+    expect(result).toContain(
+      'universalSettings: { relationType: RelationType.MANY_TO_ONE }',
+    );
+  });
 });
diff --git a/packages/twenty-sdk/src/cli/utilities/entity/entity-field-template.ts b/packages/twenty-sdk/src/cli/utilities/entity/entity-field-template.ts
index b0b15cfa75..dd4cf8a62c 100644
--- a/packages/twenty-sdk/src/cli/utilities/entity/entity-field-template.ts
+++ b/packages/twenty-sdk/src/cli/utilities/entity/entity-field-template.ts
@@ -1,4 +1,8 @@
-import { type FieldMetadataType } from 'twenty-shared/types';
+import {
+  FieldMetadataType,
+  type RelationOnDeleteAction,
+  type RelationType,
+} from 'twenty-shared/types';
 import { v4 } from 'uuid';
 
 export const getFieldBaseFile = ({
@@ -10,6 +14,10 @@ export const getFieldBaseFile = ({
     type: FieldMetadataType;
     objectUniversalIdentifier: string;
     description?: string;
+    relationTargetObjectMetadataUniversalIdentifier?: string;
+    relationTargetFieldMetadataUniversalIdentifier?: string;
+    relationType?: RelationType;
+    onDelete?: RelationOnDeleteAction | 'None';
   };
   name: string;
 }) => {
@@ -18,6 +26,38 @@ export const getFieldBaseFile = ({
     ? `\n  description: '${data.description}',`
     : '';
 
+  const isRelation =
+    data.type === FieldMetadataType.RELATION ||
+    data.type === FieldMetadataType.MORPH_RELATION;
+
+  if (isRelation) {
+    const hasOnDelete = data.onDelete && data.onDelete !== 'None';
+    const importLine = `import { defineField, FieldType, RelationType${
+      hasOnDelete ? ', OnDeleteAction' : ''
+    } } from 'twenty-sdk/define';`;
+    const onDeleteSetting = hasOnDelete
+      ? `, onDelete: OnDeleteAction.${data.onDelete}`
+      : '';
+    const morphIdLine =
+      data.type === FieldMetadataType.MORPH_RELATION
+        ? `\n  morphId: '${v4()}',`
+        : '';
+
+    return `${importLine}
+
+export default defineField({
+  universalIdentifier: '${universalIdentifier}',
+  name: '${data.name}',
+  label: '${data.label}',
+  type: FieldType.${data.type},
+  objectUniversalIdentifier: '${data.objectUniversalIdentifier}',
+  relationTargetObjectMetadataUniversalIdentifier: '${data.relationTargetObjectMetadataUniversalIdentifier}',
+  relationTargetFieldMetadataUniversalIdentifier: '${data.relationTargetFieldMetadataUniversalIdentifier}',
+  universalSettings: { relationType: RelationType.${data.relationType}${onDeleteSetting} },${morphIdLine}${descriptionLine}
+});
+`;
+  }
+
   return `import { defineField, FieldType } from 'twenty-sdk/define';
 
 export default defineField({