Hi there 1. In an assembly, when ever any references are missed of particular part Pro-e asks redifine, supress, Clip supress, delete and Freeze for that part, If u supress, It will supress the failed part and It will ask the next child part references, of failed part. If u clip supress, It will supress the failed part and cheld parts of failed part. (It wont be asked references for chaild part) If u Freeze, failed part will be freezed, Here u can redifine later. 2 On top of model tree u can see the Settings " Settings -> Tree filters -> change the display settings Activate the Suppressed objects. Venu