You can rehost placed reference points from and to splines, reference planes, edges, and surfaces.
When you rehost a hosted point, any geometry that is applied to its work plane will move with the point.
Rehosting a hosted point that is part of a spline
Rehosting a hosted point with splines applied to its work plane
When you rehost a driving point, any geometry that is dependent on it will adjust accordingly. If the new host is a spline, the driving point will become a hosted point along that spline. The spline that originally hosted the point will remain modifiable and adjust to the new host position.
When rehosting to a different plane, the point remains driving, and it only changes position and work plane orientation.