Thank you for joining the thread and adding your voice to the conversation, murfnem.

If you have a customer that has a repeat invoice or estimate, we can duplicate the invoice instead of entering all the info twice. Since there are two duplicate invoices created, we can manually delete the duplicate one. Here's how:

1. Find and open the duplicate invoice.
2. Click More at the bottom.
3. Select Delete.
4. Click Yes.

You can also check out this article to learn more about deleting invoices and other transactions: How to void or delete an invoice or other transactions. To create a duplicate transaction instead of entering all the info twice, follow the steps below: 

1. Go to Bookkeeping then Transactions then select All Sales, or go to Sales then select All Sales.
2. Find the invoice or estimate you want to copy.
3. In the Action column, select the dropdown. Then tap Copy.
4. Edit the invoice or estimate as needed, then press Save.

If the customer needs the same invoice regularly, just set up recurring transactions instead, or create the same invoice for multiple customers. On the other hand, after a customer accepts your estimate, we can convert that estimate directly into an invoice. When converting it, the estimate and invoice are linked, which keeps your books accurate. Here's an article you can refer to for more insights about converting an estimate into an invoice in QuickBooks Online.

Lastly, I've got you this helpful article in case you need some ideas about how to manage your customer transactions: Income and Expenses.

Please know that I'm only a few clicks away if you have any other questions or concerns. I'll be here to help. Have a great rest of the day!