You can create a hierarchy from the property sheet of, or in the Browser under, a dimension.
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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.