Model Parts, Diagrams, Dictionary Items, and Properties > Model parts > Using the model parts topics
  
Using the model parts topics
The Model Parts reference section of this Help includes the model parts that appear in the Relationships pane.
Each Model Part reference topic includes the following information:
A description of the model part.
A link to the associated modeling topics in the Modeler Help.
Links to the diagram and item topics that are associated with the model part.