How do you make an invoice from paid to un paid

You've come to the right place for assistance, tsrsecuritysyste. I can help you make an invoice from paid to unpaid in QuickBooks Online.

In order for the invoice to show as unpaid, the received payment linked to the sale transaction needs to be deleted. To do this:

1. Go to the Sales menu and proceed to the Invoices page. 
2. Find and click the Edit button to open the specific paid invoices.
3. Click on the 1 payment hyperlink in the upper right-hand below the PAID payment status and hit the date.
4. From the Receive Payment page, click the More button at the bottom and select Delete. 

I'm also sharing a screenshot for reference.

Once you want to keep track of invoices paid by your customers, you can accept their payments and start reviewing your accounts to ensure they always match your financial statements.

I'll be on this forum anytime you require additional assistance managing invoices in your account. Keep safe and have a great day ahead!