itil category display improvement with different entities

It would be greatl if it was possible to display the ticket categories independently from the entity.

example :

I have a root entity with Software category and Office, ERP as subcategories

In a child entity, I would like to add another category (ex: VPN) under the category of the root entity Software

and the logical displaying would be independent from entity (just use entities membership to display correctly) as :

Software

  >> Office

  >> ERP

  >> VPN

the VPN category would only be displayed to members of the child entity (and possibly their children entities)