The submodel tab (shown below) allows you to reference a subprocess chart when you are creating hierarchical models. All activities have a submodel tab in their properties dialog. For more information, see Hierarchical Modeling.
Subchart If the activity is to be linked to a subprocess, enter the name of the subchart file defining the subprocess.
Simulate subchart If a subchart is defined, it may be ignored for a particular run by unchecking this option. If checked, information defined for the activity is ignored as control drops to the subchart.
Activate If a subchart is defined, that chart will be opened. If a new name is entered into the Subchart field a new blank model will be created and activated.
Submodel tab will not show on 50 object licenses.