Hi, I need to d&d Elements for general. I've one column lots of rows. How do i get the coordinates?

The whole tree is on column. The Elements are flexible (more/less/open or closed). I need to drag&drop Elements.   How do I get the coordinates for general?

Thank you very much

F.E.: d&d Element2.1 into Element3

Element0

       ->Element1

                   ->Element2

                          ->Element2.1

                    ->Element3

....