n1) My suggestion works for any flat surface in space. If your surface is normal to a global axis, then you don't need to make a new coordinate system.n2) Use a Remote Displacement and assign Rotation about X = 0 and Rotation about Y = 0, leaving the other four DOF set to Free. The nodes will remain in a plane parallel to the original plane. nThere are two behaviors to set in a Remote displacement: Rigid or Deformable. In a Rigid behavior, all the nodes on that plane are locked into a rigid relationship, but can move as a group in any direction except for the two rotations that are set to 0. The other behavior is Deformable, where the nodes are allowed to move relative to one another, but it is only the average of all the nodes that is set to zero rotation about X and Y.n