This is a post by Punditas on their blog.

About how Creo 7.0, Multibody definition is maintained during data exchange. This helps preserve design intent during an Import/Export operation. The multibody definition is maintained in both exported and imported Creo Parametric 7.0 geometry. Export operation Multibody models in Creo Parametric preserve multibody definitionBody characteristics, such as body name and body appearances, are transferredConstruction bodies for each exported profile…

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