Enter it all under Business. It will send any excess over to Schedule A.
Self-employed health insurance deduction goes on Form 1040 line 29, as long as the expense is not greater than your net self-employment income. If it does exceed your net self-employment income it gets split automatically. An amount equal to your net self-employment income goes on Form 1040 line 29, and the remainder gets added in to medical expenses on Schedule A.
