Open the Dimension Editor
When working on a cube model, you can double-click on any dimension to open it in the dimension editor. The dimension editor is where you to work on the hierarchies, levels, secondary attributes, and snowflake dimension relationships of a particular dimension.
Procedure
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Double-click on the header of a dimension on the cube canvas or in the Dimensions panel. 
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This opens the dimension editor: - The dataset that the dimension is based on shows in the center of the dimension editor canvas.
- For dimensions that originate from the fact dataset (degenerate dimensions), you will see the fact dataset repeated here.
- For snowflake dimensions, you may see multiple datasets or dimensions on the canvas.
 
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Use the Hierarchies panel to edit the hierarchies, levels, and secondary attributes of the dimension. 
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Click the cube name to return to the main cube canvas.