limiting foreign key choices in a selection field

I have a model such as:

class Part:
    maker = ForeignKey(Maker)
    ......

When I make a form to enter the "part"
information, if I user standard
AddManipulator, maker will become a selection list of all
possible
makers. What if I only want to show a sub-list of makers
that belong to
a specific "category". I suppose I should use
custom manipulators, but
don't know exactly how to do. Pls help!


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