Every time I add a new subcategory for my posts, I have to edit ACF so it will show those fields for that new subcategory as well. Would it be possible to make so that every child category inherits its parent settings?
What you’re going to need to do if you want to do this is to build a custom location rule for “Term Ancestor”. There’s a tutorial on it here http://www.advancedcustomfields.com/resources/custom-location-rules/.
Is this still available? As I couldn’t find the “Term Ancestor” tutorial.
The tutorial is on adding a custom location rule in general and may not be for the specific type of location rule that your looking for. Since I posted my last comment here I have created several examples of custom location rules here https://github.com/Hube2/acf-filters-and-functions