Get your taxes done using TurboTax

When you go into your Business income section, one of the first questions it asks is what is your businesses name.  It says, First, lets cofirm your business name and address.  There you can select that you use your own name or that it has a different name.  When you select it has a different name from your own, a box will appear for you to enter the name of your business. 

If you have already entered your other business info, then just click back on the business tab, select edit and then update next to Business Profile.  Here is where you will enter your business name.