> ## Documentation Index
> Fetch the complete documentation index at: https://studio.assembly.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom Field Options

> Options for multi-select custom fields, defining the available tag values and their display colors.

This is a sub-resource of [Custom Field](/docs/api-reference/resources/custom-fields) and represents the options for a multi-select custom field. A multi-select custom field acts like a tagging feature where you can define which options are available as possible values for each client for that field.

A multi-select Custom Field will have its `type` set to `multiSelect`.

See notes on [Create a Client](/docs/api-reference/resources/clients) for an example on how to format the keys and values in a `customFields` object.

## Properties

**id** `string`\
The unique identifier for this item.

**label** `string`\
Display name for the option (tag).

**key** `string`\
Unique identifier used by the API to denote this option in READ and UPDATE queries on Clients. Auto-generated, typically a camelCase version of the name of the field. (e.g. File Sharing → `fileSharing`).

**color** `string`\
Color used to display the option (as seen in the dashboard). This is a RGBA color value, e.g. `rgba(204, 0, 0, 1)`.