Super cropping has many advantages when done correctly. You could grow multiple strains and almost get all the tops to be the same height allowing better light penetration and the prevention of overshading by more vigorous strains in the same area. I have grown Sativas short with this technique to make them have the stature of a Indica dominant cannabis plant. Reference the picture above for the best type of cropping on a plant that was topped twice when cloned. You basically take a stem and start squeezing it to crush the fibers in the stem. Once this is accomplished lightly turn that branch downward and away from the light. If done correctly, the inter nodes that would have normally been shaded will now sprout forward and one cola can potentially lead to several colas this way.

Pictured above is a unruly supercropped plant that was not watched carefully after training. Sometimes the plant is so vigorous that it will just fix itself and resume a vertical approach. The key is to keep that supercropped branch(s) horizontal as long as possible to allow the smaller inter nodes that previously were shaded, to mature and thrive.