Box 14 of form W-2 is a sort of catch-all. Most of the time, this is for information and does not affect your taxes. PRETX presumably means Pre Tax.
Please read this TurboTax Help topic on Box 14 of Form W-2.
Pre tax means the amount has already been deducted and you don't get to deduct it again. That is, that amount is NOT include in box 1 of your W-2.