remove internal parts?

 From:  paulrus
5856.1 
Hi guys -

I am working on a project where the client provided me with a STEP file. I'm going to be rendering it out for them. However, they sent the full CAD file, which has a lot of internal parts you'll never see in the render. The client decided to merge the object together, so in MOI all I have under objects is 1 layer.

Is there a way to get MOI to remove all the internal parts? The issue is, I run out of memory when I try to export the object.

Thanks!

Paul