Links can transmit transform information from a parent to a child. By default, a child inherits all of the transforms of its parent. To set an object's ability to inherit the move, rotate, and scale transforms of its parent, you use the Inherit rollout of the Hierarchy panel. Use its settings to limit which transforms a child inherits.
The Inherit rollout is available only when you have selected a single object. When multiple objects are selected, the rollout is disabled.
Set the Inherit options to release the link components between a selected object and its parent for any world axis of Move, Rotate, or Scale.
The options that appear when you expand the Inheritance rollout are determined by the transform controllers assigned to the selected object.
The Inherit rollout for objects using standard position, rotation, and scale controllers contains three groups: one each for Move, Rotate, and Scale. Each group contains three options, one each for the X, Y, and Z world axes.
When turned on, transform information from the parent is passed on to the child for the selected World axes.
When turned off, transform information for the selected axes is ignored by the child.
Imagine you are animating a Ferris wheel that rotates on the world Y axis. The wheel is the parent and the cars are its children. You want the cars to ignore the Y axis rotation of the wheel. Otherwise, the passengers would all fall out. You use Link Info to turn off the Y axis option on the Rotation group of the Inherit rollout for each car.