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Organizing a project using nesting
When you nest compositions, you organize your project into a hierarchy. In its simplest form, nesting means that you combine two or more compositions into one main composition from which you render the final movie. A composition inside another composition becomes a layer within the parent composition.
Use composition nesting to save time working and rendering. With composition nesting, you can do the following:
Apply complex changes to an entire composition
You can create a composition containing multiple still images, nest the composition within the overall composition, and animate the nested composition so that all the still images change in the same ways over the same time period.
Reuse anything you build
You can build an animation in its own composition and then drag that composition into other compositions as many times as you want. This can save large amounts of space, especially for complicated effects, such as 3D layers.
Update in one step
Update many composition copies in one step by editing the original animated composition.
Alter the default rendering order of a layer
You can specify that After Effects render a transform change (such as rotation) before rendering effects, so the effect applies to the rotated footage.
Note: Parenting is another way to apply complex changes to an entire composition. For information, see Understanding parent layers.
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