Generally, the 1099-B itself will come with the basis as $0.00. You will need to correct the basis of the sales as you have already paid taxes on the transaction in your W2.
When you enter you 1099-B information you will be asked: 'Do these sales include any employee stock? This includes ESPP, RSU, RS, NQSO, and ISO' Say yes.
Then you will be asked 'What type of investment did you sell?' Select the type of Investment.
Check the box that says 'The cost basis is incorrect or missing on my 1099-B'.
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