a field is just one field. You can't stack different fields on one field. If you are thinking of a cascading list (pick 1 and then multiple options appear) you can one do a parent and child.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.