User Profile Fields for Only 1 Group

[vb_guru]

I have created a special subgroup of registered users based upon a registration profile question. I want them to answer a bunch of questions only related to this subgroup. How to I do this so I can have them update their profile in the user CP and answer all the questions but at the same time not display the questions to all the other groups.

A related question. Is it possible to do this during registration. For example, they select "I am user type XYZ" they register and then taken to a new page where they answer a bunch more profile questions that only they can see on this new page and in the user CP area?

Thanks in advance!