[ORD] Drainage and Utilities Component Catalog link to Feature Definitions

What makes the link between the Drainage and Utilities features (inlets, manholes, inlets, etc.) and their corresponding Feature Definitions? I have already set up our standard Feature Definitions tied to their Feature Symbologies and Element Templates and cells. How do I link them to the D&U items? Do the names need to be the same, or is their some other way to link them?