NJ & NY taxes

I have seen questions like this answered on the forum before, but I am still confused about NJ and NY taxes.  Here is the situation for my son:
- He lives in NY, and works in NJ

- Box 1 is ~$132K

- Box 16 for NJ is ~$114K
- Box 16 for NY is the same has box 1 (~$132K)

 

I know that I need to do NJ non-resident first. 

Q1: In the workflow, I removed the NJ wages, just leaving the NY wages of $132K.  Then I entered $114K in the screen which asks how much of the $132K was earned in NJ (since this is box 16).  Is this the right thing to do?

This results in NJ taxes of ~$5600.

Assuming this is the right thing to do, I move on to NY taxes, filing as a resident.

Q2a:  For NY taxes, I assume I should use $132K as the total amount since that is want is in box 16.  And then I claim the $5600 from NJ in form IT-112-R so that I'm not double taxed.

-OR- 

Q2b: Do I state that my NY taxes are ($132K - $114K) = $18K, and not file IT-112-R.

Or do I have this all wrong all together?