Same CCK field in one content type

Question

I have a content type named "school;" this content type has the "teacher" CCK field, but the number of teachers is not same for any school.
I need a thing like "add new teacher" button, which can be used to a new "teacher" CCK field. Does anyone know a module to do this?

Answer 1

Set the number of allowed teachers to "Unlimited".

Answer 2

School needs to have a nodereference field pointing to teacher. Then, as tim.plunkett said, you need to make the number of teachers node reference field to unlimited. Same as the one detailed here, but the number of values set to unlimited.