Hi Andy, welcome to the forums.
Unfortunately no, you can't. 3DVia acheives size and performance efficiency by rendering parts as meshes-much the same way that Edrawings does. Consequentially, it's output files are all mesh formats like STL, OBJ and 3DS.
Now you can insert some of these formats into SolidWorks and other CAD programs, but they come in as faceted models which don't have analytic surfaces so mating those components and generally working with them in the assembly comes cumbersome.
Your best bet is to obfiscate the internal details using the tools in Pro-E/Wildfire/Creo.
SolidWorks has a couple of tools that are effective towards this end: Save-as-part and Defeature. If Pro-E doesn't have something and your organization has a seat of SolidWorks or Rhino, maybe you could use one of these programs to remove your internal details.
it has been a long time since I used Pro-E, but back then they had a tool called shrink wrap that would do what you are looking for.
Thanks for your responses guys. John, you answer was great, very thoughtful and informative but it looks like the Shrinkwrap feature Jeremy mentioned is my best bet for now so he gets the "correct answer".