Where do i enter my NYS Property Tax Relief Payment in my Turbo tax?

If you are taking the itemized deduction on your tax return (federal side), reduce the property taxes you are claiming as a deduction by the amount of the Tax Relief Payment you've received. That's all you need to do. If you are taking a standard deduction, you do not need to enter it on your return at all. 

The New York return section may ask you if you received a payment or the amount, but that does not transfer to the itemized deduction.  You must report the amount by adjusting your property tax in the main itemized deduction interview.