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I can help you in recreating that estimate to the right one, @philip23.
There are times that you'll create an estimate for the wrong customer. However, you can easily delete it and recreate to the right one. Let me show you how:
Check this article for more information on how to delete and create an estimate: Set up and use estimates.
Also, here's more information on how to convert an estimate into an invoice in QuickBooks Online.
I'm always here if you need more help with your estimates. The Community is always here to assist. Have a wonderful day!