To file an additional return using TurboTax Online,
you will need to create a new account. Please see the following TurboTax
FAQ for instructions on how to start another return using TurboTax Online.
If you have several returns to file, you may be interested in purchasing
a TurboTax CD/Download, as you can e-file up 5 federal returns for no
extra charge, whereas you will be charged for each return (unless eligible for
free filing) using TurboTax Online.
https://ttlc.intuit.com/replies/3288574
