> ## Documentation Index > Fetch the complete documentation index at: https://rollout.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Create Custom Field > Requires `customFields: true` in the credential's `entitiesToSync` selection and a connector that supports this operation. [Choose what data to sync](https://rollout.com/docs/advanced-guides/controlling-which-records-sync-with-rollout), or [fix an entity that is not configured to sync](https://rollout.com/docs/troubleshooting/entity-not-configured-to-sync). ## OpenAPI ````yaml /openapi/crm.json post /customFields openapi: 3.0.3 info: title: Universal CRM API Documentation description: Development documentation version: '1.0' servers: - url: https://crm.universal.rollout.com/api security: [] paths: /customFields: post: tags: - Custom Fields summary: Create Custom Field description: >- Requires `customFields: true` in the credential's `entitiesToSync` selection and a connector that supports this operation. [Choose what data to sync](https://rollout.com/docs/advanced-guides/controlling-which-records-sync-with-rollout), or [fix an entity that is not configured to sync](https://rollout.com/docs/troubleshooting/entity-not-configured-to-sync). operationId: postCustomFields requestBody: required: true content: application/json: schema: anyOf: - type: object properties: type: type: string enum: - text label: type: string name: type: string required: - type - label - type: object properties: type: type: string enum: - date label: type: string isRecurring: type: boolean name: type: string required: - type - label - isRecurring - type: object properties: type: type: string enum: - number label: type: string name: type: string required: - type - label - type: object properties: type: type: string enum: - dropdown label: type: string choices: type: array items: type: string name: type: string required: - type - label - choices application/x-www-form-urlencoded: schema: anyOf: - type: object properties: type: type: string enum: - text label: type: string name: type: string required: - type - label - type: object properties: type: type: string enum: - date label: type: string isRecurring: type: boolean name: type: string required: - type - label - isRecurring - type: object properties: type: type: string enum: - number label: type: string name: type: string required: - type - label - type: object properties: type: type: string enum: - dropdown label: type: string choices: type: array items: type: string name: type: string required: - type - label - choices multipart/form-data: schema: anyOf: - type: object properties: type: type: string enum: - text label: type: string name: type: string required: - type - label - type: object properties: type: type: string enum: - date label: type: string isRecurring: type: boolean name: type: string required: - type - label - isRecurring - type: object properties: type: type: string enum: - number label: type: string name: type: string required: - type - label - type: object properties: type: type: string enum: - dropdown label: type: string choices: type: array items: type: string name: type: string required: - type - label - choices responses: '201': description: The created custom field. content: application/json: schema: anyOf: - type: object properties: type: type: string enum: - text id: type: string label: type: string name: nullable: true type: string originalIds: type: object additionalProperties: anyOf: - type: number - type: string original: type: object additionalProperties: type: object additionalProperties: {} required: - type - id - label - name - originalIds - original - type: object properties: type: type: string enum: - date id: type: string label: type: string name: nullable: true type: string isRecurring: type: boolean originalIds: type: object additionalProperties: anyOf: - type: number - type: string original: type: object additionalProperties: type: object additionalProperties: {} required: - type - id - label - name - isRecurring - originalIds - original - type: object properties: type: type: string enum: - number id: type: string label: type: string name: nullable: true type: string originalIds: type: object additionalProperties: anyOf: - type: number - type: string original: type: object additionalProperties: type: object additionalProperties: {} required: - type - id - label - name - originalIds - original - type: object properties: type: type: string enum: - dropdown id: type: string label: type: string name: nullable: true type: string choices: type: array items: type: string originalIds: type: object additionalProperties: anyOf: - type: number - type: string original: type: object additionalProperties: type: object additionalProperties: {} required: - type - id - label - name - choices - originalIds - original description: The created custom field. '400': description: Response for status 400 content: application/json: schema: type: object properties: errorMessage: type: string required: - errorMessage '409': description: Response for status 409 content: application/json: schema: type: object properties: errorMessage: type: string enum: - >- Data for this credential is not ready yet. Please try again. required: - errorMessage '423': description: >- 423 Locked — the credential is temporarily frozen by an operator. Reads still work; POST/PATCH/PUT/DELETE are rejected until it is unfrozen. Unlike 424 (invalid credential), do not re-authenticate — retry later. content: application/json: schema: type: object properties: errors: type: array items: type: object properties: message: type: string required: - message required: - errors security: - jwt: [] credential_id: [] components: securitySchemes: jwt: type: http scheme: bearer description: Consumer JWT minted by the tenant's backend credential_id: type: apiKey in: header name: X-Rollout-Credential-Id description: The Rollout Credential ID to use for queries/mutations ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.