Thanks, but I feel like I maybe did not ask the right question. 

All of the work done up until recently on QBO was on the Accrual basis (August 2020 to March 2021). Upon preparing our taxes, I realized this and changed to Cash in the advanced settings menu. When I run the P&L for last year, the COGS appear when Accrual is selected, but they disappear when Cash is selected (see attachment). 

Is there a way to make last years transactions appear as if they were done as Cash (i.e. show on the P&L when I toggle to Cash, i.e. retroactively make it look like we were using the Cash basis the whole time)?  

Note: the books were being handled by someone else and I've found only recently that they actually weren't being handled at all, so nothing to date has been reconciled. I'm basically doing everything from the past now to make it right, so I'm fine with undoing things to make this work as Cash as it should have been.

Thank you again.