My business code is 454110 but i can~t change it in the Schedule C form. It seems always 999000

If you leave the question regarding the work you do blank, TurboTax will add a generic code: 999000.

 

1. Go to Wages and Income. 
2. Select review next Self-employment income and expenses
3. Edit your line of work 
4. Scroll down to Business summary and select Edit next to Your business info
5. Edit work Description Under General Info