How to lookup values for preset or viewonly

I have a form CourseType where every coursetype is explaind with
name, duration, price and so on.

At a form "Courses" i have a LookUp for [coursetype].[Name] and [trainer].[name].

I like to have a field [duration] which should display (on editable) the value of the matching [coursetype].[duration] of selected coursetype and a field [price] which should preset (and editable) with the value of [coursetype].[price] of selected coursetype.

Any hint how to do?

Thank you
Ralf...