Hi guys.
I was wondering if there is a way create a sim in the CAS and then to export it with all the meshes and textures it's made of. Do you know any ways to do it?

Sims consist of a set of references to base meshes and all the morphs being applied to them, plus references to textures in the CAS parts being used for clothing. No, I don't know of any tool at this time to pull all those references and export a mesh in the fully morphed shape of your sim, plus the texture images - if that's what you mean.