to the description above given by @Mike9241 the only people that should need to either provide lots of transaction detail or mail stuff in, are those with massive number of adjustments i.e. wash sales, AMD or noncovered sales. Otherwise in TT just input everything without adjustment at sales summary level for short and long term which will go onto Schedule D only; then use a separate 1099-B input at detailed level to input the detailed items which will go onto Form 8949. It doesn't take long really unless you have over a hundred of these things. For most people they shouldn't need to do import 1099s with all this detail, nor mail the details to the IRS.
