"Related Permissions Module" settings
What this extension provides is the ability to deliver access control via Relationships.

Hence if you make Relationship Type xxx a permissioned relationship and then make JOHN a manager for MYCO, and if MYCO has permissioned relationships for Mary and Bob, and you set CiviCRM permissions so that people with Role of Manager to not view/edit ALL contacts then John will be able to only see Mary and Bob, and not other contacts who have no relationship to MYCO