Community property self-employment income reduction?

I have to subtract income from my self-employment income because of community property I had to award my ex from our divorce. However, turbotax will not allow me to enter a negative number under Uncommon Income. I don't want to report this as negative W2 income since it would not reduce my business net income. How do I report this negative self-employment income on Turborax?? As a business expense perhaps?