Yes, you may include commissions and selling fees as Selling Expenses related to your option transactions.
On the 1099-B entry page, check the box for "I need to enter...other adjustments."
Enter the total adjustments for this sale and enter code E in the Adjustment Code box.
According to the instructions for Form 8949, page 10: Code E: "You received a Form 1099-B or 1099-S (or substitute statement) for a transaction and there are selling expenses or option premiums that aren't reflected on the form or statement by an adjustment to either the proceeds or basis shown."
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