Taxpayer emailed me Form 8949 from his Coinbase portal with box C checked in lieu of 1099-B. It has hundreds of transactions, which will be impossible to list on the "Quick Entry Table." Can I just enter total proceeds and total cost on the 1099-B worksheet and attach Coisnbase copy of 8949 to tax return? The problem is that the figures from the 1099-B worksheet flow to Schedule D, Part Box 1a as opposed to Part 1 Box 3 (Total transactions reported on 8949 with Box C checked.)