This product is in Beta. Please reach out to your Account Manager for more information. Please note that this Help Center article is in progress and will be updated.
Reference Data is available in Builder BETA! Now located in the settings gear of relevant fields, you can add reference data by importing comma separated value (also called CSV) files or using the Google Sheets integration. Fields will have a lightning bolt icon to indicate that it has reference data attached.
Additionally, all field types that support reference data are available to test in the interactive preview.