My client made a non-deductible contribution in 2018 and did a backdoor Roth conversion in 2020.  Her tax preparer wasn't able to prepare 2018 Form 8606 back then so we will file it manually. 

I already entered the 1099-R and is now trying to fill out 2020 Form 8606.  I don't see where to enter the amount for line 2 (total basis in traditional IRAs).

Thank you in advance!