In the Transformations command, you can coincide a plane of the source LCS with an arbitrary plane, using the Fully Combine option in the plane manipulator's contextual menu. Using this option enables filters for selecting planes on the Filter Toolbar. Then you need to select a plane in the 3D scene. Upon combining planes, origins are also combined. A new transformation is added to the transformations list looking like this:
Set Plane
Applying this option deletes all other transformations belonging to the same group of transformations.
Such transformations can be edited by re-selecting the surface.