BANK FEED MATCH TO EXISTING RECORDS DEBITS AND CREDITS

Hi, I would like to know how I can match existing records to a bank feed withdrawal that is made up of multiple invoices from different suppliers as well as a credit from one supplier. Approx 20-30 suppliers total.

Our suppliers invoices are sent to a third party that collect payment from us to send to them but sometimes a credit may not be applied in the same month as the original invoice so there is only the credit for that particular supplier but it reduces the total balance that the third party deducts from our account at the end of the month.

I can select all the supplier payments but the credit invoice doesn't show up to select so that it balances.