Save and Link Interfaces
Engineering systems often use the same interface definition for multiple projects. For example, a data feed can be standardized across a system to have the same structure to facilitate processing. By default, interfaces are stored within the architecture model and are not visible outside the model. However, if you want to create a group of models where components of one model refer to another model, you can take advantage of the data dictionary to store interfaces so that they may be shared across models.
Use the 
menu to save an interface to a new or existing data
dictionary. Create a new data dictionary by selecting Save to new
dictionary. Provide a dictionary name.
You can also add the interface definitions in the model to an existing data dictionary by selecting Link existing dictionary.
Use the 
button to import interface definitions from a Simulink® bus object, either from a MAT-file or the workspace.