This is a post by Aaron Shaw on PTC site.

A while ago, we introduced “flexible modeling” into Creo. Flexible modeling adds direct modeling capabilities to our traditionally parametric 3D CAD system, so you can easily make changes to a model (thanks to flexible modeling) while retaining design intent (thanks to parametric modeling).

Flexible modeling is especially useful for early concept design work in which models change often, as well as for last-minute changes to existing models.

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