using the 1099-B worksheet for form 8949 you can enter summary totals for each category A,B,C,D,E,F. since you have to mail in the 2020 return you would then need to attach a copy of the 1099-B. code M must be entered in column F for each line on the 8949 where you are entering summary totals
you can also just enter summary totals for types A & D in the top section of the 1099-B worksheet as long as there are no adjustments. then you do not have to submit details to the IRS
