You can start your 2019 online return over and transfer from your new 2018 file. Do you have the .tax2018 data file on your computer?
You can Transfer the prior year from the Desktop program into the current Online versions. But if you already started an online return you will have to clear it out and start over or set up a new online account. How to clear and start over
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-clear-and-start-over-in-turbotax-onli...
How to transfer into the Online version, expand the blue link if you used the CD/download last year........
https://ttlc.intuit.com/community/entering-importing/help/how-do-i-transfer-last-year-s-return-into-...
By the way, that article should say .tax2018 instead of .tax2019 everywhere.
