I have an assembly consisting of several subassemblies. Each subassembly is, when originally made as assembly, constrained with parts that can be moved. (Linked together) These assemblies become subassemblies when placed in a new assembly, but now as fixed parts, no movement is possible. Then to the point: I go to the explorer, find a subassembly and activate «make flexible» Now I expect the subassembly to behave as if opened as assembly in separate window. This is not the case. When I activate «make flexible» the parts become unconstrained and must be reconstrained in the top-assembly. Am I missing something? Added info: The assemblies are originally step-files from external sources and constrained by me. Could this be the reason?