Running Multiple Disk Quotas Policies

Do anyone know of a way to create multiple disk quotas policies in Active Directory. We are running Windows 2003 server and want to create 2 policies to run on each server. One for students and one for teachers. The problem we are having is that the last one applies. I don’t think you can assign this to a user container since it is a machine policy. It has to be assigned to the container holding the file server. Has anyone ever done this before?