subpages for editable profile

[webhoes]

Hello,

I am working of a site for a sport organisation.

All affiliated gyms can edit their profile. I have used the advaced mode so that if you create a new page under location the gym can login and edit their profile.

i also want that they can add instructors as child of their profile and also are able to edit those instructors.

I can not get passed the able to edit all subpaged or none.

How should this be done? Or is this not possible?