# Create metadata field definitions

> Create custom metadata field definitions in your organization library.

You can create new metadata field definitions from the Asset Manager interface or from the [API](https://services.docs.unity.com/assets-manager/v1/#tag/Metadata-fields-management). This allows Contributors of your projects to add metadata fields to assets. You can also remove a metadata field definition so it’s not listed anymore.

## Prerequisites

Before you start, make sure you meet the following prerequisites:

* You have the Contributor or higher role.

## Create a custom metadata field definition

To create a custom metadata field definition from the Asset Manager web:

1. Select an asset. A side panel appears on the right.
2. Select **Edit**.
3. Go below to the **Custom** section and select **Add custom field**. The **Add custom metadata** dialog opens.
4. Select the **Select metadata** dropdown menu.
5. Select **+ New custom metadata**.

> **Note:**
>
> The **+ New custom metadata** option only appears if you are the **Owner**, **Manager**, or the **Asset Manager Admin**.

6. Enter a unique metadata name.
7. Choose a **Field type** from the eight available types.
8. For Single select and Multi-select metadata types, add the accepted values and press **Enter** to validate the input.
9. Select **Add**.

The new metadata field definition is now added to your organization's asset library and any Contributor can add the custom metadata field to their assets.