I know how frustrating it can be when we're unable to copy or duplicate our estimate, @CecilyN. Let's ensure you can make a copy within the specific estimate.

To create a duplicate or copy of your estimate, you can select the small gear icon or the manage option. Then, under the Actions column for that estimate, select Make a copy. To do so, follow the steps below:

1. Go to your Estimate transaction that you want to make a copy of.
2. Select the small gear icon or the manage option.
3. In the Actions dropdown, select Make a copy.

Refer below for the screenshot:

I’ll be sharing these resources that will guide you in sending estimates and converting them to an invoice:

• Create and send estimates in QuickBooks Online
• Convert an estimate into an invoice in QuickBooks Online

If you have any follow-up questions regarding the copy option from within the estimate or anything else related to QuickBooks, feel free to ask me. I'm always here to help you, @CecilyN.