if you are inputting as a sales summary there is a checkbox for "I need to adjust my total cost basis" and you can enter it there
But, entering wash sales as sales summaries will trigger a need to mail your 1099-B to the IRS.
The better approach is to enter these as "one by one" sales with all the details, there will be a checkbox "I have other boxes on my 1099‑B to enter" and you can just enter the details in the boxes as shown on your 1099-B
You also don't need to enter everything as one by one just the sales items with adjustments, and then rest you can put as a sales summary
