Hi,
How do you assign field to a member group? At registration stage, user can select which member group to register. Different registration form for each member group.
Let say I have 2 member groups, doctors & engineers. Doctors will register at registration form call Doctor and engineer will register at registration form call Engineer.
Within Doctor form, their profile field will have a check box set for their expertise (Anesthesiologists, Cardiologists, Dermatologists, etc.