You can view all of your categories for a catalog by managing your catalog. When categories are created in the parent catalog, the categories can automatically be applied to each subcatalog. However, custom categories can be created in each subcatalog.
Categories will be used as part of an additional search functionality available in a future release.
The Categories tab shows you the category name  and the type of category .
To add new categories, select categories from subcatalogs and tabs.
Manage Subcatalog Fields
If you are viewing a subcatalog, any existing categories will automatically apply when the Inherit categories from catalog ancestry button is enabled . The categories will appear but will be uneditable .