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  • Something like this would need to be done using custom JavaScript and AJAX. I’m currently working on a project that I’m doing this on. I won’t go into all of the details about the PHP side of things, that’s covered here well here, but I can give an example of the type of JS you’ll need to to add. is the documentation on adding custom JS for ACF.

    And some of what I’ve been working on can be found here

    If you look on line 363 at the function _para_tax_change, this function makes an AJAX request based on a select field that where the names of the taxonomies on the site are listed. The AJAX request returns a list of terms in the taxonomy and updates another select field with the choices.