If I pay union dues in New York, how do I get the form IT-196, Line 44, Addition Adjustment K to show it? I entered all my Misc job and investment expenses in Federal.

Your union dues would be on Line 21 of your IT-196. Line 44 is the amount of your union dues disallowed due to the 2% floor.

Per the instructions for IT-196, Line 44, Section K, this entry equals the amount of disallowed union dues included on the Unreimbursed employee business expenses that were subject to the 2% miscellaneous itemized deduction floor.

Per NYS instructions for Form IT-196 (page 19), 

You can get to it directly from the forms view.  It does not appear to show up in the step-by-step (at least for me).

From the menu bar, choose View -> Forms, then go to the IT-196.  If you click on Line 44, then on the magnifying glass icon that appears just to the left, the Addition Adjustments worksheet opens.

I also found that TurboTax transfers the amount from federal over to line 21, but not line 44.