After you file

I've used turbo tax for 7-8 years.  The amended return for 2016 resulted in some business loss carryovers, etc.  I want to prepare my 2018 tax returns but need to update my turbo tax files with the 2016 information then see what effect that has on 2017 then carry that forward to my 2018.  What's the easiest way to do that?