Hi Jinwhan,
Can you explain the query in more detail? Please note, SpaceClaim rebuilds the model from nothing when replaying scripts and assigns new IDs to all the entities. If you are generating the geometry via script, you should not declare design parameters to individual parts in downstream applications (for example, Mechanical). To properly scope loads and boundary conditions for geometries generated via script, you should generate Named Selections for them in the script itself, and then scope the loads or boundary conditions to the Named Selections downstream.
-Aniket
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