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@mmittanck:  Let's say you do the math on your K-1 Sales Schedule, and determine that you have a Cap Gain of $500.  If TT creates an extra 8949 with -$100 on it, then your 1099-B (from your broker) needs to have $600 on it to get to the correct total of $500.

What TT is referring to with the "box A or B" stuff actually comes from the 1099-B.  Every 1099-B (usually, you can import all these from your broker, and easily find them in Forms mode, will have a box A, B, D, or E checked.).
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**Note also, I'm not a Tax Preparer/CPA. Just a volunteer, seasoned, TurboTax user.
Use any advice accordingly!