State tax filing

Thanks for the clarification TomD8. Hopefully one last question:

 

I found Line 31 of my Schedule C, my net self-employed income. Now, if I want to determine the "California amount" portion of that net amount, would I do the following calculation?

 

(Net Self-Employed Income) x (Gross CA income / Gross All Income)

 

Or, to ask in another way - do I attribute my gross business expenses in proportion to where the gross income came from?