Yes. You have to start a new blank 2016 return to transfer into. Are you using the Desktop program? Go up to File - New and it should find the .tax2015 file and ask if you want to transfer it. Or you can point it to the 2015 file. You can only transfer at the very beginning before you start 2016 so you will have to start over.
If you are using the Online version, Go to My Account > Tools > Transfer last year's TurboTax return from your computer > Continue
