Community Tip - When posting, your subject should be specific and summarize your question. Here are some additional tips on asking a great question. X
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.