You create a message part from the message format property sheet.
        
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                Open the message format property sheet, click the Definition tab, and select the Message Parts radio button in the upper part of the dialog box.
            
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                Click the Add a Row tool.
                
            
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                Type a name and a code for the message part, and click Apply to commit the creation of the new message part.
            
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                [Optional] Double-click the new message part to specify its properties.
            
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                Click OK in each of the dialog boxes to return to the model.