This is a post by Cat McClintock on PTC site.
Not long ago, PTC introduced Unite technology in Creo Parametric. A breakthrough enhancement, Unite technology made it possible to directly open and reuse data from a variety of non-Creo CAD systems—all without translators or rework.
Now with Creo 4.0, we’ve refined the software even more to help you succeed in a world where all models don’t come from the same 3D CAD package. In fact, we’ve added so many new ways to transfer information between Creo and other supported CAD systems, we can’t go through every one in a single blog post.