You can probably put the summary (combined totals of Basis and Sale price) onto Form 8949.
See "Special provision for certain corporations, partnerships, securities dealers, and other qualified entities." on page 3 of the instructions for Form 8949.
https://www.irs.gov/pub/irs-pdf/i8949.pdf#page=3
This special provision applies to certain corporations, partnerships,
securities dealers, and nonprofit organizations. Individual
taxpayers aren't eligible except in rare
circumstances.
You may enter summary totals instead of reporting the details of each transaction on a separate row of Part I or II or on
attached statements if:
-
You file Form 1120S, 1065, or 1065-B or are a taxpayer exempt from receiving Form 1099-B, such as a corporation or exempt
organization, under Regulations section 1.6045-1(c)(3)(i)(B), and
-
You must report more than five transactions for that Part.
If this provision applies to you, enter the summary
totals on line 1. For short-term transactions, check box C at the top
of Part I even if the summary totals include
transactions described in the text for box A or B. For long-term
transactions,
check box F at the top of Part II even if the summary
totals include transactions described in the text for box D or E. Enter
“Available upon request” in column (a). Leave columns (b) and (c) blank. Enter “M” in column (f). If other codes also apply, enter all of them in column (f). Enter the totals that apply in columns (d), (e),
(g), and (h).
Don't use a separate row for the totals from each broker. Instead, enter the summary totals from all brokers on a single row
of Part I (with box C checked) or Part II (with box F checked).
