There's NO NEED to enter lot-level detail when you report your sales, you just need to have your summary numbers accurate. So you should be able to enter one sale and use the word "various" in the date acquired field.
You can enter your 1099-B as a regular stock sale (not using the guided interview), and not indicating Employee Stock. Enter the Cost Basis from your 1099-B (may be $0). Then you'll get the box to check for Corrected Cost Basis.
If the broker is NOT reporting basis to the IRS you simply enter the correct total basis and the sale is properly reported. If the broker IS reporting basis to the IRS and that basis is incorrect, (reporting only your out of pocket cost), then enter the 1099-B as it reads, click on the blue "I'll enter additional info" button and enter the correct basis on the following screen.
Your Cost Basis is what you paid for the stock, plus the discount you were taxed on your W-2. You may still need to do the math to divide that amount by number of shares sold and add to the cost basis from your records, if this applies.
This automatically puts a Code B on Form 8949 for you.
Here's more info on Employee Stock Purchase Plans and discussion on Reporting Multiple Lots of Employee Stock Sale.
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