Categories restrict upload/edit to certain users

We have 2 major categories of documents, lets' call them Catgory A and Category B. Each category has a number of sub-categories.
We have two teams A and B who upload to their respective categories.
I would like to restrict Team A just to Category A and sub categories of A. And Team B to be restricted to Category B.

I don't think using the current ACL, I can do this. Is this right or is there a way I can restrict which users can up load to which categories?

Hi David,
Currently, Edocman only has feature to assign user(s) to specific Categories. When user is assigned to specific category, he will able to see the category at front-end, and he can upload documents for that category.
Thanks
Dam