I'm not sure if this can be done, but before I go down too many bunny trails, I thought I would ask.
The scenario is that is have a parent organization that has multiple sub-organizations under it. Each organization has it's own login.
Currently each sub-organization has a webform that they complete when they are logged in. The suborganization and the parent organization can view the results of the webform, but no other sub-organization has access to that webform.