You can do it they way you did it already, as it does end up in the Sch D area and there is no 1099B issued.
The way it most commonly reported is in the K-1 area.
There is a question early on in the K-1 area, titled: "Describe this Partnership" and the 4th one down needs to be checked, "Disposed of a portion of my interest in partnership during 2016"
Then the next screen will be titled, "Tell Us About the Sale"
I have seen it both ways, as long as it is reported and you have the sales price and the basis entered correctly is the main thing.
