If there is a section that says Other Transactions Form 8949,X, the Cost Basis or Holding Period (long or short term) is unknown by your broker, your 1099-B shows a Code X to indicate that.
If you are sure that this is a double posting of all of your sales, you can post both sets, but on the Other Transaction grouping you should make the basis the same as the proceeds. Follow these steps to do this:
To correct the cost basis on stocks from a 1099-B
- Start at Investment income
- Select Stocks, Mutual Funds ....
- Choose the Broker or Institution
- Select the individual stock
- The data you entered will be there
- Toward the bottom of the screen select [I'll enter additional info on my own]
- In the entry for Box 2 enter Corrected Cost Basis
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