Shortcuts and object replications allow you to reuse objects defined in one model or package elsewhere.
Shortcuts
A shortcut is an object that represents and references a target object.
Object Replications
While shortcuts allow you to reference objects in other models, the complete definition of the target object can only be accessed if the target model is open, and you cannot locally redefine any of the properties of the target object. For example, in one model you may need a Client table with Name and detailed Address columns, while in another you may need only the Name column. In this case, instead of using a shortcut, you could replicate the object.