if you want to e-file do the following. don't import those transactions. instead just enter totals on a 1099-B wks
you should also see the words "check here if this summarizes multiple sales" check it. on form 8949 there will appear a name a statement that says "see attached" and a code M
what you do is submit form 8453 with the box 8949 check and a copy of those trades. usually just submitting an original or copy of that section of the 1099-B will do. just so the numbers match the 8949 code M.
https://www.irs.gov/pub/irs-pdf/f8453.pdf
read the filing instructions for where to file and when.
if there are multiple broker codes such as;
b (short term basis not reported)
c (short term sales and basis not reported)
e (long-term basis not reported)
f (long term sale and basis not reported)
enter each on a separate line with the proper code and that boxed checked
if the box date sold turns red just enter 12/31/20
