Thanks Earnie to your suggestion.

But I'm not sure to understand how can do it with Organic Group.
I try to explain my requirements and if you can, please tell me how to 
do it with og.

I have 3 type of users:
   1 - Shop 1 
   2 - Shop 2
   3 - Shop 3

For every of this user types I have created a different roles.
I don't know how to make different registrations form for every type, probably 
by using some external module?
Otherwise a user after has been created, if has made "shop 1" registration, he should 
redirected to a creation of "group shop 1" and the same process for the other types.

I don't have much experience with og.

Thanks
Nicola 

2012/3/29 Earnie Boyd <earnie@users.sourceforge.net>
Sounds like you have a need for drupal.org/project/og which allows
assignment of a user as administrator of a group (shop) to allow other
users (customer) access to the group (shop).  Or perhaps something
like drupal.org/project/domain and friends to assign a sub-domain to
shop where customers are independent of other shops.

--
Earnie
-- https://sites.google.com/site/earnieboyd
--
[ Drupal support list | http://lists.drupal.org/ ]



--
Nicola Bisinella

Mobile:          0039 3348284966
Email:           nicola.bisio@gmail.com
Site:             http://www.nbisinella.org
Linkedin:       http://it.linkedin.com/in/nicolabisinella
Twitter:          http://twitter.com/nicolabisi
Facebook:     http://www.facebook.com/nicola.bisinella
GPG:            0x903EB725