Save yourself a bit of time. Since you're using the desktop version, I know exactly what you need to do.
Under the personal income tab scroll down to Business Items and elect to start/update Business Income & Expenses (SCH C). You'll come to a summary screen that will "list" the business, and it will have an EDIT and a DELETE button to the right of it. Click DELETE, then YES to confirm the deletion, and you "MUST" continue working through until you come to a screen with a DONE button on it, and click that DONE button. Your deletion doesn't "stick" until you click that DONE button.
