@pliuworld
Actually it IS possible--if you still have the *.tax2018 data file.
- Open your 2019 online return.
- Once it is open, go to the left menu column and click on TAX TOOLS, then TOOLS.
- In the Tools window, choose "Transfer last year's TurboTax return from your computer."
- It will ask "Are you sure?" since it will have to clear your started online return in order to transfer.
- When you say "yes" to continue, it will then ask you for the location of the *.tax2018 data file on your computer, and then will upload it to transfer it into a new 2019 online return.