Root container allow you put this script on any container and control point another container as "root" for the script. By default (if this param is empty) it works with current container "this".
You can control Where to place all ainmation within "root container".
Offset director useful to shift each directors with Start offset and Step of increment. If you want inverse you can point negative Step.
You can collect or spread your animation into certain directors. There is the option of how to move animations:
If you have that tree:
Option "By childs name" gives you that result: