I think pm is making up a bunch of extra steps but he isn't providing us with any information about what he is actually doing, so we can only use our imagination.
I should point out that the copy paste works a little bit differently depending on if you are dealing with groups, commands, or actions. Only groups can be pasted or dragged into an empty part of the tree. Commands must be dropped or pasted on an existing group, and actions can only be pasted in the LCB.
I will make a more thorough tutorial on this subject but for now I think yours will help. I hope.