Working with Submodels
Arena provides a way to encapsulate different parts of a model, a
submodel. New submodels can be added by using
Object > Submodel > Add Submodel. A new submodel can also be added by clicking on the
Submodel 
button. The submodel can then be named by right-clicking and selecting
Properties....
You can open a submodel by double clicking on it. You will then see an new flowchart view (representing the model within the submodel) with entry

and exit

points. These points correspond to the entry and exit points on the submodel module in the main flowchart view.
You also can "nest" submodels within other submodels.
The easiest way to find your way around your submodels is using the
Navigate template.
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MichaelOSullivan - 25 Aug 2009