I have the following IF statement for a custom data validation but it doesn't
work.

IF($B$1="North Sky Homes",B483:B489,IF($B$1="Rising
Star",B494:B504,IF($B$1="Universal",B509:B517,IF($ B$1="StoneRidge",B522:B539,""))))


The lists in B483:B489, B494:B504, B509:B517,B522:B539 are those models
associated with the builder chosen in B1 (B1 has a data validation list where
you choose the builder)

Thanks.