[GNC] How to search for a word in a description in an invoice

[John Griessen]

I search for purchases that  have a description with an inventory tag in it frequently to check that I've done all bookkeeping 
steps when I make a sale.

How do I find a description with an inventory tag when I sell that same item in an invoice?
When I start a search from accounts assets for inventory tag [cmp]  I find the original purchase, my COGS entry, but not the 
invoice line item...