As an active investor, you must be aware that your category Box A or Box D sales without adjustments do not require Form 8949, so there is no reason to import or key in those transactions.
Instead use the "enter a summary" option to put your numbers on Schedule D Line 1a or Line 8a.
No mailing is necessary, no attachment is necessary.
If TurboTax insists on dates which are meaningless in this context,
Enter 1/1/2021 for Date Acquired.
enter 12/31/2021 for Date Disposed.
