You should be asked to "Tell us about your business" during the TurboTax interview. At that point, you can report the disposal of your business. The TurboTax FAQ below will instruct you on deleting your Schedule C that transferred over from last year, as well.
https://ttlc.intuit.com/replies/3300011
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
