I found this helping to select parent categories
function my_taxonomy_query( $args, $field, $post_id ) {
// modify args
$args['parent'] = 0;
// return
return $args;
}
add_filter('acf/fields/taxonomy/query', 'my_taxonomy_query', 10, 3);
Image example: http://prntscr.com/e5i7a7
I created another custom field to select the child category, but how would it work?
