Business & farm

Because this investment is structured as a partnership it pays no taxes.  Instead, it issues a K-1 which passes all the Partnerships taxable entries to you.  You handle this at tax time by

1. Going through the TT K-1 interview, entering all the info provided
2. Dealing with the complexity of correctly accounting for Cap Gains / Losses.

To answer your questions below:

1. The -55,091 -- cumulative adjustments to basis -- is the total of all the taxable entries the Partnership is passing to you.  In this case, its 11C - 13W (edit to add + $87 that must be shown somewhere on the K-1 that wasn't part of what was pasted here) .  When you enter those into TT, those losses / deductions will be reported on your tax return.  BUT, because you didn't actually experience those losses -- they're basically just on the K-1 -- your basis in the investment changes.  Instead of having a basis of 160,250 you add in the "cumulative adjustments" to get a new basis of 105,159.  So when you sold, your Cap Gain just got $55,091 larger.  That obviously offsets the other losses you're entering, but you still have to go through the reporting because the tax rates on all the bits and pieces can be different.
2. When you enter the K-1, it will ask you about the details of your sale.  Simplest approach is to enter 0 for sales and 0 for basis (in the K-1 interview).  Doing that will prevent TT from doing anything to your 1099-B.  Then, even though the 1099-B is box A (reported to the IRS), you CAN change the basis.  The interview will give you this option and you simply check the box that the "basis is incorrect" and enter the correct one.  Its always possible that the IRS could ask for justification for doing this, but your K-1 is the justification:  the broker shouldn't have used the incorrect $160,250 basis, and the IRS won't have any reason to argue with that.
3. Yes, as explained above.  The huge loss will be completely offset by the increase in Cap Gain.
4. Yes.  Since it looks like the Schwab K-1 only covers the Schwab 1099, you'll need something similar from Robinhood.