You can not attach an 8949 to a Schedule D. You can do an attachment to an 8949
https://proconnect.intuit.com/community/form-8949/help/attach-a-summary-statement-to-schedule-d-form...
If all the transactions are covered transactions, you do not even need to do an attachment, just enter summary amounts for short and for long.
Answers are easy. Questions are hard!
