Can I void a paid invoice and apply the payment to a different invoice?

Yes, @greenfg17, we can void a paid invoice and apply it to a new one. I'd be glad to walk you through the process in QuickBooks Online (QBO).

Before doing so, it's important to note that voiding an invoice will keep the invoice number and list it in reports but change the amounts to zero. Since the invoice has already been tagged as paid, the payment will be detached and turned into credits. That way, we can apply the credits to a new invoice.

Here's how to void the invoice:

1. Go to Sales, then select Invoices.
2. Find the invoice that you want to void.
3. In the Action column, select the dropdown ▼, then select Void.

For more information about voiding invoices, please visit this article: Void or delete transactions in QuickBooks Online.

If you want to copy the old invoice, you can go to the Audit log to see the details of the voided invoice and create a new one.

After that, you can apply the credits to your new invoice. Here's how:

1. Go to the Sales tab, then select Invoices.
2. Locate the new invoice.
3. Click Receive payment.
4. Under Outstanding Transaction, select the invoice.
5. Under Credits, select Unapplied Payment.
   
   
   
   

If you wish to apply credits to your invoice automatically, you can turn on the feature from the settings. Refer to Step 1 in this article for details: Turn on Automatically apply credits.

Let me know if there's anything else I can do to help you manage your invoices or any sales transactions, @greenfg17. Always drop your comment below, and I'll provide the necessary help.