Point constraints let you make an object move/follow the position of another object. This is useful for having an object match the motion of other objects. For more information and examples of point constraints, see Point constraints.
When creating point constraints, you can first set creation options and then create a point constraint, or you can immediately create a constraint with the current creation options. Using the constraint creation options, you can also add the constraint to an animation layer. See Point Constraint Options.
To create a point constraint
To add a point constraint to an animation layer
From the Animation Layer drop-down menu, select the animation layer where you want to add the constraint.
The constraint animation is now contained in its assigned animation layer, and it contributes to the result animation in your scene.