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Layers, in turn, are nested in containers known as groups. When you create a layer, that
layer is placed inside a group. You can drag a layer from one group to another, but layers
cannot exist on their own, outside a group. Layers nested inside groups appear indented
in the Layers list and Timeline.
Enclosing group
Nested layers
A group can also contain other groups nested inside it. In this way, you can construct
complex hierarchies of nested groups, with each nested group subordinate to the group
that contains it.
Enclosing group
Nested groups
It’s a good idea to group layers that work together as a unit. Doing so ensures that
animation and effects applied to the enclosing group affect all layers nested in that group.
By nesting related layers you want to animate inside a group, you can save time by
animating the enclosing group, instead of animating each layer.
234 Chapter 6 Creating and Managing Projects