Box 16 probably includes this amount already. Easiest way to know is this: add box 1 and box 14. If the total is box 16, you need add nothing further. If you were to put those figures in box 14 into the screen you are mentioning, they are not subtracted out of your income but rather added into NJ income. The screen is asking you to add back what is not reported on the W-2, but in your case, your W-2 already includes this information.
Click on this link for a NJ website that discusses this subject a little further: NJ Division of Taxation - NJ Income Tax Wages - State of New Jersey
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