Documents Categories
From here you can create additional Document Categories with access permission assigned to different roles. Only Managers & Site Admins can create additional Document Categories.
You can see above the additional categories are restricted to Manager & Site Admin roles, they won't show to other roles when they view the Workplace Document Categories.
If you edit a Category you will see the options below, you can see the additional sub categories, and where the permissions are set for the Category. You also have the ability to add an end date if you want to track expiry dates.
All Document Categories are automatically "shared" to Site Admins, they can see all documents within the site. Site Admin could create a Document Category that is only visible to other Site Admins.