I sometimes get asked to explain how to define what to build for a Rhapsody model simulation. You can do this either using global parts (which exist in the browser) or using a composite structure, i.e. a Block that has parts which are then connected together. The latter is actually the more powerful as you can tell Rhapsody to derive the bits of the model to build using the "assembly block". Using the property called HighlightElementsInActiveScope you can see in the browser which elements are in active scope, i.e. will be built. This video hopefully explains.
I tried to make the model festive! Happy Xmas!