Hi there…
I ran into something similar before. The closest solution I found was: https://www.bobz.co/dynamically-populate-select-fields-choice-in-advanced-custom-fields/
This requires JQuery if you don’t want to reload the page…
You could try a Step 1, Step 2 process… where each Step saves to the DB.. then it’s easier to filter the list in the subsequent step by using ACF filters and PHP…
It’s doable, but a very advanced topic. Hope that you get it sorted out.
We might be able to help a piece at a time if you implement many of the steps, and run into any snags along the way.
