I read the article about the conditional formula but my goal is different. I don't want to control the feature of the parts with conditional formula, but want to control that a part will be shown in an assembly if a condition meets the criteria. Example: I am in an assembly environment. There is a rectangular frame (including more parts). If the length of the frame is more than 800mm I want that SOLID EDGE insert/show the middle frame in the assembly otherwise I don't need that part. Could it possible to manage the occurrence of a part in an ASSEMBLY based on any condition? I tried the "alternate assemblies" or "property manager" without any success.