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Hi,
I got "Master" file (prt) and I want to convert it to skel without external ref.
Is it possible?
Without maintenance I cannot read that support article, so my apologies if this is a duplicate of that.
You can only create a skeleton in the context of an assembly. This is from Creo 2, but later versions should be similar.
You now have a skeleton that is a copy of your source part. If you already have parts that copy geometry from the original part, you will have to create new references to the skeleton instead and fix any children.
You may have luck (if you are not using Windchill) in renaming the new skeleton part to have the name of the original part and therefore "tricking" Creo into using the skeleton instead, but that requires some planning and managing what is in session when you do the rename within Creo (don't do it in Windows).