Updating 2020 return with amended 2019 return

I realized after starting my 2020 return (and transferring data from my 2019 return) that I needed to amend my return for 2019.  Is there a way to update my 2020 return with the amended return, or do I need to start over?  I haven't submitted my 2019 amended return or my 2020 return yet.

 

Thanks.