How would I restrict certain user levels from editing categories
You would need to remove the capability for a Editor role to manage_categories add_action( ‘init’, ‘remove_editor_manage_categories’ ); function remove_editor_manage_categories() { $role = get_role( ‘editor’ ); $role->remove_cap( ‘manage_categories’ ); } Source http://codex.wordpress.org/Function_Reference/remove_cap