Is it possible to set up NS so that an invoice, upon generation, has distinct buckets/applicable amounts in AR? What i'm trying to do is when you pay the invoice, you can tell NS if the invoice is paying for items, shipping, or tax, so if a customer does NOT pay for one of these, we can see it reflected and know when a customer shorts us on one of these and we can write them off properly in the end

No.

Duly noted, thank you, Kevin!

@Will Coburn would it be better to apply a credit memo which you generate when you receive payment. Apply the short-payment and the CM posts the short payment categorization

Yeah, I think this is what we're going to do