Need to make a QBB copy of company file for year 2018 for IRS audit. It looks if you condense files you cannot do an end date it changes the file for a period copy?

Let me share some information, Roadoe.

When you create a backup company file (.qbb copy), it saves everything in your company file. Having said that, you're unable to create one specifically for 2018 data. For more information, you can check this article: Back up your QuickBooks Desktop company file.

With regards to using the Condense Utility files, it only reduces your company's overall size and still keeps all data and details. The process is also not reversible. I'll include this article to guide you: Use the Condense Data utility.

Feel free to get back to this thread if you have additional questions. We'll reply as soon as we can. Keep safe!

@Roadoe 

Consider condensing your data to remove 2017 and older data. Then utilize a deleter tool to remove 2019-2021 data in bulk.

https://transactionpro.grsm.io/qbd

https://partners.saasant.com/affiliate/idevaffiliate.php?id=5051_2

Otherwise, you may purchase a 3rd party service to do so.