Still not a solution. But the more we talk about this, the more insight I gain into how QB is built.

Apparent the core problem is that:

Find

Memo

allows a person to search the description field of any transaction for text, but there is no way to include an invoice amount in the resulting report.

On the other hand:

Report

Custom Reports

Transaction Detail

allows a person to create a report that includes invoice totals, but 

Filters

Memo

only allows a person to search the memo field for text. 

So apparently there is no way to select invoices based on a criteria search of the description field and include invoice amounts. If you do find first, the selection process works, but you can't include invoice amounts. If you do a report, you get invoice amounts, but can't search the description field to select the invoices wanted.