You can create a hierarchy from the property sheet of, or in the Browser under, a dimension.
            - 
                    Open the Hierarchies tab in the property sheet of a dimension, and click the Add a Row tool. 
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                    Open the Attributes tab in the property sheet of a dimension, and click the Create Hierarchy tool. 
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                    Right-click a dimension in the Browser, and select . 
 
For general information about creating objects, see Core Features Guide > The PowerDesigner Interface > Objects.