To do this in Turbo Tax,
follow these steps...
Log
into your tax return. Use the search box in the upper right hand corner. Type
in "schedule c" in the box. This will bring up the "Jump to
schedule c" link...click that link. From here Turbo Tax will ask you some
specific questions about your business (1st screenshot below). You'll be led through a different screens asking you more questions regarding your business. You'll also be
taken to a screen to enter you income (2nd screenshot below). Finally, Turbo
Tax will bring you to the screen for you to choose what expenses you would like
to enter onto your tax return (3rd screenshot).