Group

Objects can be Grouped or Ungrouped so that a cluster of objects can stay together when scaled or moved.  To create a group, select more than one object or entity and then go to Tools>Group.  The objects will all become the same color.  The objects will now all behave as one.  When any one of the objects in the group is picked, the entire group gets selected.  To separate a group back into individual objects, select the group and go to the Tools>Ungroup menu.

 

Objects, entities, and even groups can be grouped.  Group hierarchies are copied and saved when you cut and paste objects.