Hi there, capnomo.

I'd be glad to provide some information about importing data from QuickBooks Desktop 2020 to QuickBooks 2018.
 

Downgrading company file is unavailable with QuickBooks. Although we can open QuickBooks 2018 to QuickBooks 2020 version, not the other way around. 

Also, I agree with Fiat Lux - ASIA's suggestion to look for third-party applications in our marketplace to incorporate with QuickBooks that can help you import or downgrade the file. Here's where you can check for a supported app that can successfully integrate with QuickBooks Desktop: Apps for QuickBooks Desktop.

Additionally, I've included an article that'll help you learn more about the new and improved features the latest version offers. This helps you manage the features that can benefit your business: What’s New in QuickBooks Desktop 2022.

You can always get back to me in this thread if you have other follow-up questions or concerns about importing process. I’ll be around ready to help you. Stay safe!