Generate a value list based on a value list

[pbucc]

hi there... been a while,

here is what i am having truble with. i have a field that is a value list (builders names). i have another field that is called "sites" i have 3 different value lists called different "builders names" in each one has about 3 to 5 different "site names". is there a way to have the value list for "sites" change as the name in "builders name" changes?

any help would be great.