Can you get to form IT-196? You have to click in the upper right where it says "Forms" next to "Notifications". As long as you're itemizing for NYS, I think TurboTax has to have an IT196 in there for you.
On line 44 of IT-196, if you click on the value for "Addition Adjustments" on Page 3 of the form (or on the blank line if there's no value there), a magnifying glass icon will appear that you can click on to go through to "Itemized Deduction Schedule Addition Adjustments", which appears in the TurboTax forms list as "Oth Add Adj" on my return. You want item 4 on this worksheet.
I really don't think I can be much clearer in the description without screenshots of my return, which I'm not going to post.
Good luck.
Edit: This is based on the desktop version. I don't use and can't comment on specifics of the online version.
