You must not be looking at the right place.  See attached for the input line for SIT, which is there regardless of whether you file IT-201 or IT-203.

For NYS residency, you need to be sure your client satisfies all the conditions, especially if you are taking an inconsistent position from previous years'.  IT-203 has questions there to catch taxpayers who are off guard.  Beware of NYC tax residency if your client maintains a home that remains available for use.