Match multiple bank transactions to a single invoice

I have an invoice from a supplier that was shipped in multiple pieces.  Consequently they charged our credit card with multiple charges.  But, we only have a single invoice entered in AP.

When trying to clear the bank transaction I can select “match to multiple invoices”, enter the vendor’s name into the “business name” and I see the single invoice.  

If I select that invoice it correctly shows me an “unmatched amount” but I can’t figure out how to them match this to the second credit card charge.

This doesn’t feel like an unusual practice so I’m assuming that I’m doing something wrong.