Jonas,
I am not sure if this can be done by J-Link , probably by Pro/TK. But this can be easely done using Reference Viewer / Show Dependency - see attached picture. What you do is :
- open Reference Viewer, go to Dependencies
- set "Breakable / Dummy" in filters. Break them by RMB / Break Dependency.
- set "Filter Model Tree" to see features that are a source of these dependencies.
Now what you said is correct - until Creo3 "break dependency" was a reversible action for Copygeom feature. Its no longer the case from Creo3, dependency is broken irreversible. Same for other types of dummy - their break is (and was) mostly irreversible.
Hope this helps
- Vlad