Scale constraints let you match the scaling of one object to one or more other objects. This constraint is useful for making several objects scale simultaneously. For more information, see Scale constraints.
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. See Scale constraint options.
To create a scale constraint
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.