Dear Leanda,
Thank you for sharing. This works for me as a filter to exclude some categories from the field in the backend (I was looking for this, to give editors less choice when selecting categories for posts). But, I was looking for a way to do this on a field by field basis. Say, for the taxonomy field “test_tax1” exclude (or hide) the categories 64,65,66 and for the taxonomy field “test_tax2” exclude (or hide) the categories 67,68.
Can you think of a way to do this?
At the moment the categories are excluded (hidden) on all taxonomy fields of the regular wp categories.
