You have to manually calculate your NOL (see Form 1045 link below) and then enter the NOL into TurboTax.
https://www.irs.gov/instructions/i1045
TurboTax does not support Form 1045 and does not carry over NOLs. If you are using TurboTax Home & Business, look for Less Common Business Situations under the Business tab. You will find the NOL carryforward start (update) button in that section.
