Currently, to block access to specific Companies, the User Permission Sets must be modified to limit the specific line for a given Company. If the user has 15 Permission Sets defined, but needs to only view 4 Companies, each of the 15 permission sets would need to be duplicated 4x, which is inefficient to set up and maintain. This math multiplies exponentially if this process needs to be repeated for multiple Users. The idea is to add a new field in the General FastTab of the User card called "Allowed Companies". The user assigning the access should be able to check/select multiple Companies for given user to access, without the need to modify User Permission Sets for each User.