What appears on your W-2 is not proceeds from the stock sale; it's the difference between what you paid for the stock (as an employee) and the FMV of the stock when it vested (your discount). There may be a notation of this amount on your W-2.
Just enter your W-2 as shown; there is no other place to report this.
The 1099-B reports the proceeds from the actual stock sale. However, since the broker doesn't know what you actually paid for the stock (as an employee) it usually shows a Cost Basis of $0.
You need to change the Cost Basis on your 1099-B entry to the FMV amount, so you don't overpay gains/loss on the stock sale.
Depending on which TurboTax you have, when you are entering your 1099-B there's a place to indicate that 'I need to adjust cost basis' or 'the cost basis is incorrect' so that you can then enter the correct Cost Basis.
You should have info from your employer in some form that tells you what the FMV of the stock was when it was vested.
Hope this helps!
Click this link for more info on How to Enter 1099-B.
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