Since the V8 is released any volume waterproof without hole is named "solid" in Google sketchup!
Just right click on it / Infos and you will see "Solid" if it is of course :)

As all volumes from Moi arrive in one component

Explode it and use the plugs below depending of what do you want

And if you want make any selection of separated volumes as groups(separated) or components, there are some scripts that make that in a seconde ;)
like this free one for example by Chris fullmer ;)
This one make Groups
http://www.smustard.com/script/Loose2Groups

and some other if you want convert Goups in components
Make_components by Matt 666
http://rhin.crai.archi.fr/RubyLibraryDepot/plugin_details.php?id=583

so any problem with any volumes from Moi export ;)