@smcbarney
Well...it depends on what form you are entering...since box 17 refers to different things on different forms.
______________
If on a W-2, and you have two different state withholding amounts?
Then you enter the first state info and it's withholding.
Then either the tax software will create a new set of boxes for the second state....or you click on a link below the first set of boxes to add another set of state boxes to enter the second state's data for withholding.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*