how to get serial numbers based on configuration items in catalog form

[RamcharanA]

1. we have a catalog form like we need to get serial numbers based on configuration item selection .
2. here some configuration items having multiple serial numbers so based on that we need to add serial numbers as drop down options when that configuration item selection.

[jcmings]

What have you tried so far? Have you tried making a dependent question that relies on the configuration item variable?