Currently, the option to import an Excel file estimate into QuickBooks Desktop is unavailable. As a workaround, you can use an .IFF file to import it successfully to QuickBooks Desktop. Or you can also check out a third-party app that has this feature.
I've included this reference for your future task in case you want to track specific aspects in your business: Understand reports. This contains sub-articles such as customizing and combining reports from two or more company files.
You are always welcome to tag my name in the comment section if you have other questions. I'd be happy to answer them for you. Take care.