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.