@bigblue2007 I'm assuming that you got 2 1099-Bs from the broker, one coded B (for short term cost not reported to IRS) and one coded E (for long term cost not reported). When you go through the TT interview, their will be a screen for "Select any less common adjustments". Check the "cost basis on my statement is incorrect" and enter the correct basis. Note that 95% of the adjustments go to the long term sale, and 5% of the adjustments go to the short term sale. But in total, the numbers you enter would add to -8 (-72+64).
In your case, its more complicated because you can't enter -8. So.... [what follows is not tax advice (I'm not a CPA -- just a volunteer), or legal advice, or anything the IRS would agree with. But for most, $8 is not worth hiring a CPA or amending past years returns].... you could set the total to 0 and then go back to the K-1 interview and put $8 into the "Sales Price" box. Dumping the $8 there will create a new 1099-B, coded F (for sales and cost not reported to IRS) for that final $8.
Final note: I'm assuming this was a complete disposition. If you still have shares of this, then you have to deal with the fact that your cost basis is below 0 and your K-1 reporting must change (you have to deal with the at risk rules) and you may need to amend past year's filings as well.
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**Note also, I'm not a Tax Preparer/CPA. Just a volunteer, seasoned, TurboTax user.
Use any advice accordingly!
