Part 4 – Parenting
In this episode, you’ll learn how to group animated elements together in Adobe After Effects CS5 to create a unified motion. This process is called Parenting. You’ll also learn how to use Null Objects to group motion together.
via Classroom: Basic Compositing and Animation in After Effects | Adobe TV http://tv.adobe.com/watch/classroom-after-effects-cs5/enjoy-the-convenience-to-do-more-with-your-photos-and-videos/