@kidoncorner -- I can give a little help, but probably not enough:
1) Cost basis going negative is where I tell folks to get help from a tax preparer who's familiar with partnerships. The issue is that the rules about how to handle suspended losses, and any cash distributions from the MLP, change as soon as your capital account hits 0. And how they change depends on any liabilities (recourse or nonrecourse) allocated to you. And since this may affect your prior year returns (depending on when you went negative), amending may be required. I'd bring in an expert is recommended.
2) I'm not familiar with the way TurboTax business sets up the interview, so can't help.
3) Try to do the over-ride on the 1099-B itself. In Premier/Deluxe, the results of the 1099-Bs flow to the 8949.
Sorry I can't be more help.
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**Note also, I'm not a Tax Preparer/CPA. Just a volunteer, seasoned, TurboTax user.
Use any advice accordingly!
