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The discount per share would be about the same for all shares sold, assuming the discount percentage did not change. So, you could take the total discount listed on your W-2 form and divide it by the total number of shares sold and multiply that by the number of shares sold short-term and that would give you the discount income for the short term sales.

You can actually choose the ESPP option to enter the stock sale and on the screen that says Adjust your cost basis to ensure your best outcome choose the option that says I found my cost basis. Then, enter the cost listed on the 1099-B form plus the applicable income listed on your W-2 to arrive at the correct cost basis for the sale. That is all you need to enter.