When creating scale constraints, you can first set creation options and then create a scale constraint, or you can immediately create a constraint with the current creation options.
To add a scale constraint to an animation layer
Turn on Maintain Offset when adding constraints to animation layers so that your constrained objects do not move unexpectedly.
The constraint animation is now contained in its assigned animation layer, and it contributes to the result animation in your scene.
Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License