My site uses a lot of categories and tags for author selection in the back-end. To make it more user friendly for authors I need to arrange the categories and post tags in numerous metaboxes for selection on the post edit screen. I would like to display some selected categories and their children in one metabox for author selection while other categories will go into a second and third metabox and so on. The same should apply to the tags. Can anyone point me in the right direction how to accomplish such a customization? Can I register new taxonomies which will include categories/tags based on their ID's and create new metaboxes displaying only those ID's?
The Wordpress default metaboxes for categories and tags display all categories in one box.