I am creating a social networking website. I am using organic group to build the site. One feature that I need for my site is, I like to allow both of the group administrator and the group member to be able to upgrade their group to a "VIP group", so they can get more services. After they upgrade the group, the group admin will turn to "VIP Group Admin" role, and the group member will turn to a "VIP group member" role.

I found that I can use the "Role assignments" function in Ubercart to upgrade a "Role". But I am not sure if there's a way to upgrade a "Group"? Is there other alternative way to achieve this? If not, can anybody suggest me what kind of module I need to make this work? Maybe I can get a developer to help me out?

Thank you very much for any advise.