Apply the transformation
to the object’s parent.
Grandparent
Apply the transformation
to the object two levels up in the scene hierarchy.
Snap Type
Only appears in Snap
2 points to 2 points. You click two pairs of points on the two objects
to align them. This option controls what Maya does when the pairs
of points are different distances.
Left
Snaps the first and third
points you click, and aligns the second and fourth points in the
same direction as the first and third.
Middle
Snaps the second and
fourth points, aligns the first and third in the same direction.
Right
Snaps the midpoint of
the first and third points to the midpoint of the second and fourth,
and aligns the other matching points in the same direction.