Hello @albertoarias
Thank you very much for contacting us. If you have large data sources and want to populate dropdown fields based on others, you can use the DS fields distributed with the Developer and Platinum plugin versions. The DS fields read their values from external data sources like databases, CSV files, JSON structures, ACF, other submissions, and third-party services.
Learn more about DS fields by reading the following blog post:
https://cff.dwbooster.com/blog/2019/02/14/ds
Best regards.