show list of available SNs during assembly build, fulfillment, etc

I seem to remember Netsuite showing me a list of SN available for Serialized assemblies.  The problem is that when I build an assembly I need to enter the SNs for some of the members of that assembly and the only way I can enter them is to first go to the member's record and copy and paste SNs from there.

Is there a way to turn on the list of Sns?  Is this a feature that used to exist and is now gone?

Thanks for reading,
Steve