Hello Andrea,
Are you trying to bind the packages to the categories, For Category access and package roles please follow the below steps as I describe below,
Before giving access to a certain category for a particular role you have to set from the edit category option, then you have to make empty for Allow Access option or have to give a particular role on it like as I image attached or as usual for select member option too,
because
Package Access = Package Access + All Category Access = All Visitors + Author = All Visitors
and Package Access = Package Access empty + Category Access(Author) = Author
or Package Access = Package Access(Author) + Category Access(Author) = Author
More details can be found in the below link,
Allow Access: Access Control Option
Hope you have understood now. please let me know
Thank you and regards