[itsm] Building Definitions for ITSM::ConfigItem

Not sure if this will be answered either, but I will send this out and continute to disect the documentation and source code. I am building a couple of configitem service class related items. For arguments sake, we will say CAR and stereo are two new items. I want to be able to tie the stero to the car, but am clueless on how to cross the 2 definitions correctly, any help would be appreciated. Joshua McDowell