You can create a message format from a flow property sheet or from the Browser or Model menu.
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                    Click the Create tool next to the Message Format list located at the bottom part of the flow property sheet. 
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                    Select   to access the List of Message Formats, and click the Add a Row tool. 
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                    Right-click the model (or a package) in the Browser, and select . 
 
For general information about creating objects, see Core Features Guide > The PowerDesigner Interface > Objects.