Hello and welcome to the Community, bourney. We'll be happy to share some guidance on matching single payments to multiple supplier invoices in QuickBooks.
1. If the payment is in the For review section of your connected bank feed, simply select the Supplier (in the Supplier/Customer field) when reviewing the transaction, and change the Account to Creditors then Add. This will post the payment as an unapplied credit on the supplier's account.
2. From here, select Make payment on each of the invoices that you have recorded manually in QuickBooks. The unapplied credit will show under Credits on the Bill payment screen where you can tick to apply as full or part-payment.
If you don't have your bank connected in QuickBooks, record the payment using a Bank deposit instead (+ New > Bank deposit). Complete the fields as you see fit, then scroll to Add funds to this deposit to select the supplier and account (Creditors). After saving, match this to the invoices as outlined in Step 2.
Thanks for reaching Intuit support. We're just a post away if you have any additional queries.