Isolate Geometry

It has to reference SOMETHING. The easiest thing to do might be to create a plane in the same location and located it based on the earliest datum geometry, either the first 3 planes or a coordinate system. Then reroute all the references to the original plane to the new plane. Alternately, you could redefine the original plane the same way. Nothing in Pro/E is just hanging in space except imported geometry (STEP, IGS, etc.) and I don't think that ever includes planes.

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skeleton is the way I would do it

THIS SIGNATURE IS INTENTIONALLY BLANK

Sure, that's effectively what isolate in Catia does; it deletes the link between the surface/plane and it's parent and then fixes it in space - by referencing the internal csys of the part. It sounds like, dg, you're saying that if this is a plane I could maybe take some measurements (angle and offset) from each default plane and then create a new one based on those dims. Good work around for a one-off maybe but not great to do multiple times . A skeleton as in a regular copy geom, Kor? That will update whenever I regenerate the part.