https://www.youtube.com/watch?v=MwJDy5rNTmo this one shows exporting into blender to use as a template for size and such. and then to import back in should be able to do the same with carrara. There are a number of tutorials that are on the right of the page. https://www.youtube.com/watch?v=PRRy9rsK-QM another one that has more links on trhe right