This is a post by Mike Gayette on PTC site.

Basic 3D CAD systems do a great job of helping you create simple geometry and design intent. But when structures get large and surfaces demand a little extra panache, you can make your job much easier with the help of Creo’s design extensions.

These extensions are specially designed to help you with time-consuming tasks, helping you turn out high-quality designs at the breakneck pace of today’s competitive markets.  

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