Thanks for posting your question in the Intuit Community, info181,

Let me share information on how to link lump sum payment to multiple invoices.

In your case, we can use the Receive Payment feature. Here's what you'll need to do:

1. Click the Plus icon at the top.
2. Select Receive Payment.
3. In the Receive payment window, choose the specific customer.
4. Enter Payment date, Payment method, then select the account where the payment is deposited to.
5. In the Outstanding Transactions section, select the multiple invoices and enter Payment amount.
6. Click Save and close.

Once done, if the bank account is connected into your QuickBooks Online account, then you can add and match the downloaded payment transaction to the multiple invoices.

For additional reference, I'm including some helpful articles that you can check:

• How to record a customer payment
• Add and match downloaded bank transactions

If you have further questions in managing your transactions, please let me know. I'm always here to help.