You know what a group is!

Common Attributes +

Groups are useful to:

  1. transform several objects together.

  2. organise your Scene.

  3. pass Shape transforms through to the Duplicator (the Duplicator ignores transforms for Input Shapes by design but by grouping animating objects and then adding the Group as an Input Shape your duplicates will animate).

Use the ctrl/cmd + G shortcut to group selected Elements (shift + ctrl/cmd + G to ungroup)