Let me elaborate on some details on how you can correctly record these transactions, Matjlg.

Instead of entering a check for a transaction, you'll want to record a deposit stating the total amount of the multiple invoices. Then go to the Receive Payment choose Check and match the invoices and deposit. But before that, let's delete the check first. To do so, follow the steps below:

1. Go to the Expenses menu, then select for the check to delete.
2. Under the Action column, click the dropdown arrow, then choose Delete.
   

Once done, create a deposit with the total amount of the payment.

1. Click + New.
2. Select Bank deposit.
3. Enter the necessary information.
4. Click Save and close.

Next, receive the payment by following these steps:

1. Click + New.
2. Under the Customer name, make sure to enter the correct customer name.
3. Under the Payment method, choose Check.
4. Under Outstanding Transactions, select the invoices, then under Credits select the Deposit. 
5. Click Save and close.
   

Please know that even if only one invoice is created, this is only to show how the deposit and invoice show up on the Receive Payment page.

Moreover, learn how QuickBooks categorizes and matches transactions once downloaded. To know more, consider checking this article for more details: Categorize Online Bank Transactions In QuickBooks Online.

Let me know if you have any other concerns when receiving payments. The Community is always here to assist you.