If you want to use other software, such as OLT, you will have to enter everything from scratch. It won't import your prior year's return with the carryover.
If you do file with OLT this year and want to use TurboTax next year, then the best option depends on if you've already purchased TurboTax this year or not. If you have bought it, then do your return in TTax and just don't file it. You can use it as a double-check on whichever software you do file with and you'll have it available for import next year. If you don't buy TTax this year and want to go back to it next year, then you would have to start a new file when you do.