Unfortunately, transferring TurboTax Online returns into TurboTax Desktop software is not possible. TurboTax Online can't create .tt files, which is what TurboTax Desktop uses.
I do not see why this is not available. It should be made available. The only reason I bought on line last year was that they were sold out of Desktop version and now I am being punished because you want to push your online version. I am not happy about this.