Use the Linked Model builder to create and include modular functional units in an application.
Linked models are roughly analogous to Java™ classes. They contain methods and state data that can be easily accessed by the outer model (that is, the model that contains the Linked Model builder). An outer model can directly access any public methods, linked Java objects (LJOs), and action lists defined in the Linked Model builder.
Do not use linked models for inserting pages and other visual components from the linked model into the pages of the outer model. Use the Model Container builder for visual embedding.
Parent topic: Builder help
About using the builder call editor
How do I use Click-to-Action portlets?
Model Container builder
Shared Variable builder