Hey there, haberfield101.
Thanks for taking the time to visit the Community. I can show you how to remove the PAID status from your invoice.
I'm listing the steps below to get this done:
1. Click the Sales tab in the left navigation bar.
2. Select Invoices at the top of the page.
3. Open the invoice.
4. Click the payment link below the Payment Status.
5. Select the date when the payment was applied.
6. Scroll to the bottom of the Receive Payment window, and click Clear Payment.
7. Choose Save and close.
With this info, the Paid stamp will be removed from the invoice. I'll be here if you have any other questions.