Merging accounts from Quicken Mac 2017 into Quicken Mac 2020

I am using Quicken 2020 (subscription based) on my iMac. My wife has Quicken 2017 on her old Mac which I'm about to decommission. I want to merge her Checking, Saving, and CC accounts into my Quicken file and just one place where we manage our accounts. What's the best way to move her accounts without losing all the history therein? Thanks.