if you have any sales items with adjustments (wash sales, AMD etc) you can split the 1099 up and enter those as "one by one" with the details; then input the remaining balance as a separate 1099 in Turbo at the sales summary level.
This will remove the need to mail the adjustment details to the IRS and you should get prompts to that effect (also on desktop you can go to Forms mode on the 1099-B worksheet there is a checkbox at the bottom whether mailing is required... not sure with Online but maybe the same is available if you export PDF with all forms and worksheets).
