you mean .CSV
there are websites, I vouch for none of them, that offer to convert a .CSV to .TXF
once you have a .TXF file
From File Tab / Import / From Accounting Software / Other Financial Software (TXF) file / Continue / Choose a File to Import / Import now.
OR
If you have the 1099-B you would only need 6 entries in the 8949.
one for each type A, B, C, D, E, F and with code M (tells the IRS the line represents multiple trades. Then you could mail the return with the 1099-B attached.
