Use fields from your custom table(s) in subscribe forms and preference centers to capture data about your subscribers that can be used in segmentation, automation, personalization, and more. For example, include fields to ask subscribers to provide additional information about their pets, hobbies, purchase preferences, membership preferences and more.
If you have custom tables setup in your account, you will see selection menus when editing a form to choose to view fields from a table:
Custom tables are available to the Professional license or above.
At this time, forms can support fields from tables setup as a 1:1 relationship only. We're working to provide additional support for 1:Many & Many:1 table relationships in the near future.