Thanks for joining in on this thread, @M_Mercer. I’ll share some information about the pop-window so you can add multiple estimates into one invoice in your QuickBooks Online account.

In QuickBooks, the pop-up windows are used to convey a certain feature you can utilize while working in the software. A window that rises above a help topic is known as a pop-up window. Depending on the amount of text or the size of the image inside, the pop-up window automatically adapts in size.

For instance, if you’d like to combine multiple estimates into one invoice, you can click the angle bracket under the Exit (X) sign. From there, a window will appear with the estimates you’ve created for the same client. You can then click the Add button to include the hyperlinked transaction on your invoice.

Please also know that you’ll need to create the estimates first before merging them into an invoice. See this article for the detailed steps: Create and send estimates in QuickBooks Online.

Afterward, you can read through this reference to learn how to receive invoice payments and group multiple ones into a single deposit: Record invoice payments in QuickBooks Online.

Don't hesitate to post again here if you have other questions or concerns with QuickBooks tasks and navigations. I'm always around to help you happily. Take care and stay safe!