I am wondering how to copy custom geometry on multiple base points.
As like my screenshot image, I made a geometry that does not exist in Rhinocommon C# class. And I would like to copy this one on multiple base points.
yes. you can, but it is often usefull to put some sense behind it, like being the center of your volumne or a cornerpoint of, say a box/rectangle etc.
its easiest to just try out and then, once you understand how it actually works, you will find a logic that will suit you.