Controlling Projection Lines

Hi all!

I've gotten really helpful feedback from you guys so I figured since I was having a problem with this I would ask.

I have 2 planes that I've subdivided into 4 points. I projected lines from the points using a line tool in grasshopper. Now, the lines that are projected are not where I want them to be. I wanted to know if there is a way to change the control points of the lines. I want to choose which points on that plane create a line rather than grasshopper just randomly choosing which points to make lines from.

Any way to do this in grasshopper?

I appreciate your help!!