Given the 0's on every box of the K-1 (ignoring the $2 for 13W), your beginning capital account can be used as your cost basis. The sales proceeds would be the amount you (or your broker, on your behalf) received for the sale of PTP units.
Be sure you don't double count the capital gains/losses from the sale. Any capital gain/loss calculated on the K-1 interview will go to your return as a new 1099-B (code C or F). If you also report the same gain/loss on your broker's 1099-B, you've double-reported. Solve this by either setting the cost equal to proceeds on the broker 1099-B, or on the K-1.
Note that you need to verify that the broker's 1099-B used the correct cost basis (typically they don't). If not, you'll have to adjust it.
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**Note also, I'm not a Tax Preparer/CPA. Just a volunteer, seasoned, TurboTax user.
Use any advice accordingly!
