I know I can hide categories from the front pages with 'exclude' like this:
<?php wp_list_categories('title_li=&orderby=id&hide_empty=0&exclude=1,13,78,79,3023'); ?>
What I need to do now though, is hide them on the add/edit post pages on the backend. I need to leave these categories in place for legacy... but I want to limit my authors to choosing only the new categories I now have.
Is there a way I can hide those, perhaps something I could put in theme/function.php or something like that?