@Zgolf That approach definitely isn't right. Your cost is dropping below 0 because the partnership has allocated you more losses than you're able to declare. You have to 'uncheck' the box about "All of my investment is at-risk" and work through Form 6198. This will determine what losses you'll actually be able to declare from the partnership (the amount on Sched E). The allowed losses will be lower than 10,921, and will result in something that will also allow you to set your cost on the 1099-B to 0.
Note that this is a very complicated area in tax prep, and if you have questions about the nuances of basis adjustments and at-risk rules you should probably get help from a tax professional. All I can guarantee is that tricking TT into accepting a negative cost basis is NOT the right approach.
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**Note also, I'm not a Tax Preparer/CPA. Just a volunteer, seasoned, TurboTax user.
Use any advice accordingly!
