If you export an XEM created in a model, it becomes available in the List of Extended Model Definitions, and can be shared with other models. When you export an XEM, the original remains embedded in the model.
        
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                Select  to open the List of Extended Model Definitions.
            
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                Select an extended model definition in the list.
            
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                Click the Export an Extended Model Definition tool.
                 
                    A standard Save As dialog box is displayed. 
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                Type a name and select a directory for the extended model definition.
            
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                Click Save.
                 
                    The extended model definition is saved in a library directory where it can be shared with other models.