The transfer of 2019 information to your 2020 return has to be done in the very beginning, BEFORE you enter any new 2020 data.
How to transfer last year’s return? https://ttlc.intuit.com/questions/1900883
https://ttlc.intuit.com/questions/1900883-how-do-i-transfer-last-year-s-return-to-turbotax-online
https://ttlc.intuit.com/questions/2262857-when-transferring-a-tax-file-what-information-carries-over...
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
