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When using cosmetic fetures, as cosmetic skteches and the visibility of these features are organized with rule layers, this functionality ist lost when creating a merge or especially a inheritance feature.
It is necessary for a consisten layer functionality to implememt this behaviour in creo.
I like to have my own layer control. I have made it a habit to start with empty parts, or at least begin my start parts with empty parts. You get no baggage with these.