Role hierarchy is a sharing mechanism that should be used to open up opportunity sharing to directors who oversee regional managers so they can access records to assist regional managers. Role hierarchy is a way to grant access to records based on the user's position in an organization's hierarchy of roles. Role hierarchy can grant users access to records owned by or shared with users below them in the hierarchy for objects that have organization-wide defaults set to Private or Public Read Only. By using role hierarchy, the administrator can ensure that directors can access opportunities owned by or shared with regional managers who report to them