Unfortunately, you'll have to add your expenses back to your Schedule C manually in TurboTax Online. You can use your saved .txf file as a guide.
Another option would be to look in the Documents folder on your computer where TurboTax files are saved. If you open one just prior to when Schedule C was deleted, you can open that version, with Schedule C intact.
[Edited 2/11/2025 | 6:33 pm]