You can create  an activity from the Toolbox, Browser, or Model menu.
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Use the Activity tool in the Toolbox.
                 
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Select  to access the List of Activities, and click the Add a Row tool.
                 
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Right-click the model, package, or decomposed activity in the Browser, and select .
                 
         
For general information about creating objects, see Core Features Guide > The PowerDesigner Interface > Objects.