Go to Wages & Income and click I'll choose what I work on. Scroll down to Business Items and click Start next to Business Income and Expenses (Sch C.) Add your business, if you haven't already, or edit your business. Continue through TurboTax, until you see a question that asks if you have any 1099-MISC income and say no to that question. On the next screen you will be prompted to enter income or sales that are not on a 1099-MISC. I have updated my answer to include screenshots for TurboTax Premier Desktop Version.
