To configure search filter fields

The custom field must have already been created.

  1. Go to App Setup > Create > Objects and select Category Hierarchy.
  2. Scroll to Custom Fields & Relationships and select Search Filter Fields.
  3. Scroll to Picklist Values and click New.
  4. Enter the API Name for the custom field created in the Search Attribute Value custom object and click Save.

That field is added to the list and is now available in the Hierarchy Manager.

You can go to the Hierarchy Manager and add that field as a Refine Your Search question for specific categories.