How to convert a fully assembled model to one solid piece?

Someone gave me his fully assembled model of a truck made in Soildworks, and wants it to be converted to one whole solid part.

I haven't worked with Solidworks. But I'm quite familiar with CATIA. I'm wondering how I can import the Solidworks assembly into CATIA and then convert it to one solid piece.

The inside elements aren't important, only the surface and perhaps mass properties should be kept. That's because the model is to be tested for aerodynamics in Fluent, and Fluent requires the whole vehicle to be one part.

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1 Answer

convert solid file to stp
open stp file in catia.
go tool --> convert catpart from product.

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