TOPIC: Group Member Registration problem

I am developing a registration system for a school.

There are two revenue sources - annual "enrollment" fees, and actual class registrations.

Because the school gives discounts for enrolling more children in school, I needed a way to apply a greater discount to each additional child registered within a family. So annual school registrations are captured in a Group membership file rather than single (individual) registration.

Once I specify the number of children enrolling, I'm presented with screens asking the first and last name for each student/child in that family that is attending.

Once I complete this, and go to the BILLING INFORMATION, I am required to complete a Primary Student First Name and Primary Student Last Name.

I don't understand the purpose of this field, as it appears to be the one username field that enters into the Community Builder User Profile, but since the parent is the owner of the profile, either we shouldn't list any of the children, or all the children in the User Profile.

Is there a way to delete that primary student first and last name from the BILL TO section during checkout?

Thanks
Gary

I am using Community Builder as the profile by the way.