Hello there, @chittermorree. I'll be sharing more information about this matter.

I can see that matching a multiple transactions in one invoice is really useful for your situation. However, it's currently not an option in QuickBooks Online.

Although, you can either exclude the bank transactions and manually clear the payment status of the invoice in the register, or you can record each received payment and bank deposit it to each of the corresponding bank transaction to link them.

Here's how to exclude bank transaction:
 

1. Go to the For review tab.
2. Tick the checkbox for each transaction you want to exclude.
3. Select Exclude.
    

To manually clear payment status:
 

1. Select Invoices, and click View/Edit to open the invoice transaction.
2. Under Payment Status, click the 1 payment link and click on the Date hyperlink.
3. Click the More tab and choose Delete.
4. Click Yes to confirm.
    

For more details about matching and categorizing transactions, you can refer to this article: Categorize and match online bank transactions in QuickBooks Online

To learn how to combine multiple transactions into a single records QuickBooks matches your real-life bank deposits, you can check out this article: Record and make bank deposits in QuickBooks Online.

I'll be around if you need anything else or if you have any further clarifications about your bank transactions. Have a great day!