When you set a reader group restriction on a category, all of the subcategories and articles within that category automatically inherit those same reader groups. We call these Inherited Reader Groups. Any reader groups that an article or subcategory is inheriting are shown in the Inherited Restrictions section.
There's also an up arrow icon in the Restrict Viewing to Reader Groups list to identify inherited groups:
Inherited Reader Groups will have an up arrow in the Add More Restrictions sectionYou can't fully remove these inherited groups, though you can refine them. You can add additional groups in the Add More Restrictions section, but you can't remove any of the inherited reader groups.
If you do add a group in the Add More Restrictions section, a reader must belong to that group as well as the Inherited Reader Groups. Refer to Content with multiple reader groups for more information on this setup.