Hi Andrew Thank you for your reply. I take a look on the manual, it indeed answer my first and third questions. But with "avExtractedCellViewCallProc", only the "extracted database ID" is passed. I still need the "layout view info" to collect the design versions through hierarchy. I manage to find the "layout view info" in the form of "Quantus QRC (PVS) Parasitic Extraction Run Form", but I have no clue how can I link the form property with "avExtractedCellViewCallProc". Best Regards Yi
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