Mold and cast features exist at the assembly level. There are two classifications of features: regular features and user-defined features.

Regular features are special features added to a model to facilitate the molding or casting process. These features include silhouette curves, ejector pin holes, runners, waterlines, draft lines, offset areas, volumes, and trimming features.

User-defined features are created in part mode and used to create commonly used structures in the workpiece or die block. A user-defined feature is created once and used multiple times by modifying the dimensions each time it is copied into an assembly.