Form 172 cannot be attached electronically to your tax return. It will need to be printed and mailed with any applicable worksheets either with your original completed return or with an amended return used to claim the NOL.
If you know the amount of your carryforward loss, then you can enter that information into TurboTax as part of your return. The steps to take will depend on the version of the program you are using.
For TurboTax Home and Business, there is a separate Business tab at the top of the screen where you will find Schedule C, Schedule E, and other business situations. Click the Business tab and scroll to Less Common Business Situations, then click Start beside Net Operating Loss/QBI Carryforward Loss to enter your information.
For other versions, go to Wages and Income > Business Items > Business Deductions and Credits and click Start. Then select Business Loss Carryovers (NOLs, QBI) and click Start to enter your information.
For reference, here are the instructions for Form 172 and a link to the form itself:
Instructions for Form 172
Form 172 Net Operating Losses (NOLs)
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