Using Performance Modeler we can add dimension to an existing cube without rebuilding it.

Double click on the cube.

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Drag and drop the dimension from list to cube area or right click the dimension and select ‘add dimension to a cube’

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The result appears as follows:
Select what should be done with any existing data in a cube from options below:
• placed to a single member in the new dimension.
• duplicated for all members in the new dimension.
• cleared.

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Result: dimension added

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