Apple Motion 4 - Manual (Page 266)

Moving a selection in the Canvas moves all three layers simultaneously.
Before moving group After moving group
Regardless of how they’re nested, individual layers can always be animated independently.
Subordinate groups can also be animated independently, although such animation and
effects also affect all groups or layers that are nested underneath.
The following example shows how you might create a hierarchy of groups to prepare for
the animation of a human figure. Each component of the figure is a separate layer. For
example, the arm is made up of hand, forearm, and upper arm layers. Each related layer
is in a group that’s nested inside a parent group. For the arm, the hand is nested inside
the forearm’s group, which is nested inside the upper arm’s group.
266 Chapter 6 Creating and Managing Projects