well your 1099 probably lists a dozen or more individual transactions. I just set up my spreadsheet, figured out all the details and then added the basis information to the transactions that were auto-uploaded to Turbotax. If you aren’t using that automatically download feature, it would be easier to simply figure the totals, declare the basis and sales price of the underlying bitcoin sold (profit or loss) and declare that on your takes where you put individual stock/asset transactions for gains/losses.
