I've imported .stl files (Lego parts) and they come in as a faceted model....depending on how it is exported. I don't know what you mean by manipulate but If I recall correctly, you can refine and adjust the facets if you have the reverse engineering module. The vertices of the facets are selectable so you can draw curves, create surfaces, etc. based on the imported geometry....basically rebuild the geometry within Creo. That's what I was doing: Imported the faceted Lego parts and re-created geometry that I could then use. I'm sure there's more functionality but I haven't explored it that far yet.
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