The following is extracted from the NYS form IT-203 instructions. It does specifically state that the NOL must be calculated the same way as the Federal NOL with only adjustments for Non NY items. These instructions can be read at http://www.nystax.gov/ Click the forms and instructions tab and go to the instructions for form IT-203. It is covered on page 59.
New York State net operating loss
The New York State net operating loss (NOL) to be included
in the New York State amount column of a nonresident's
Form IT‑203 must be computed in the same manner as the
corresponding federal deduction, but using only New York State
items of income, gain, loss, and deduction in the computation.
New York State modifications are not included in the
computation of the NOL or in determining the amount of loss to
be used in the carryback or carryover year.
I realize this may not be to your best interest but I can only provide the rules. Unfortunately, I do not ,make those rules.