Dynamic Components - Google SketchUp Workshop: Modeling, Visualizing, and Illustrating - page 295

The bus's sliding doors do something that is subtly different. As with the van
door, both X and Y positions are animated; however, the bus doors animate
the directions in succession. This is done by animating an intermediate value
between 0 and 200. Between 0 and 99, one thing happens; between 100 and
200, something else happens.
The final animation technique allows for some parts to animate other parts.
Clicking on the bus doors or any of the vehicle's front tires animates what you
are clicking on as well as the “sibling” parts. When doing this, the intermediate
attribute that is being animated needs to be the parent component that holds
the siblings that are being animated.
This component functions on its own as a moderately detailed, “multiple-
option”-style Dynamic Component. However, if it were to become a part of a
“copy & position” Dynamic Component, the copied geometries and formulas