Lets say i have 3 k2 categories A, B, C

and defined 2 user groups --> UserGroup1, UserGroup2

The Problem is how can I : UserGroup1 can only see/edit items in category A and can only select category A as item cate in back-end UserGroup2 can only see/edit items in category A B and can only select category A B as item cate in back-end

I have ACL Manager component installed