Dear guys,          I am trying to make an assembly in creo parametric. For that purpose, I am making let suppose part A by referencing an another part B by importing thestp. file  of part B.   The problem is, when I want to delete the imported features (step file) of part B, then it also deletes the part A that I have made. I want to remain part A intact while deleting part B. What is the problem with my modelling method. Any help would be highly appreciated.