You won't be able to leave that section blank, Form 8949 uses that information.
Some brokers just only use the Letters as identification (see the list below.) so please look for those, or check with your broker.
(A) Short-term transactions reported on Form(s) 1099-B showing basis was reported to the IRS (see Note above)
(B) Short-term transactions reported on Form(s) 1099-B showing basis wasn’t reported to the IRS
(C) Short-term transactions not reported to you on Form 1099-B
(D) Long-term transactions reported on Form(s) 1099-B showing basis was reported to the IRS (see Note above)
(E) Long-term transactions reported on Form(s) 1099-B showing basis wasn’t reported to the IRS
(F) Long-term transactions not reported to you on Form 1099-B
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