@superman23
your category Box A or Box D sales without adjustments do not require Form 8949,
That summary goes on Schedule D Line 1a and Line 8a.
If you summarize on Form 8949, then it is required to attach a statement of details. therefore, "See attached" is appropriate.
To avoid summarizing, enter each 1099-B one at a time.
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Beyond the reporting exception noted above,
IRS requires details of your SELL transactions to be supplied on some Form 8949,
or on your other forms (e.g. consolidated 1099-B or spreadsheet) which have the same information and in the same manner as Form 8949.
Either way, if you choose to summarize only, you have to mail the transaction details to the IRS within three business days of IRS accepting your e-Filed tax return. (unless you have attached a PDF of the transactions details to your e-Filed return. TurboTax Online will ask for it).
