Use the Reset Transform utility to push object Rotation and Scale values onto the Modifier Stack and align object pivot points and bounding boxes with the World coordinate system. Reset Transform removes all Rotation and Scale values from selected objects and places those transforms in an XForm modifier.
To reset the transform of a group, use the Transform button in the Reset area of the Hierarchy/Pivot command panel.
Reset selected: Removes all Rotation and Scale values from selected objects and places those transforms in an XForm modifier.
Object rotation and scale are now carried by an XForm modifier placed at the top of the Modifier Stack.
When you apply Reset Transform from the Utility panel, the new XForm modifier that carries the rotation and scale values is placed to the top of the modifier stack. You can apply other modifiers above and below the XForm modifier. You can select the XForm modifier and add other Move, Rotate, and Scale transforms. You can delete the XForm modifier to completely remove the transforms from the object.You can collapse the object to absorb the rotation and scale values into the object mesh.