You can create an identifier from the property sheet of a class or interface.
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Open the Identifiers tab in the property sheet of a class or interface, and click the Add a Row tool.
                 
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Open the Attributes tab in the property sheet of a class or interface, and select the Primary Identifier checkbox when you create an attribute.
                 
         
For general information about creating objects, see Core Features Guide > The PowerDesigner Interface > Objects.