Changing the Measure Values based on Dimensions selection

[svivekh]

Hi all,
I need to build a cube with a measure which has a following concept.

The measure is a calculated measure which has the formula say x = a/b. Where x is the measure.

I have the following dimensions and measures
Dim1 Dim2 Dim3 Meas A Meas B Meas X (A/B)

Dim 3 has the values Orange,Apple,Grapes,All.(For eg).

1.If I select values for Dim 3 for analysis
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My Meas A and Meas B needs to be as present in the fact table corresponding to the respective Dim 3 value.

2.If I don't select values for Dim 3 for analysis
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My Meas A and Meas B should be corresponding to the value for 'All' in the Dim 3 (as default).

Hope u got this.

How to go about in doing this? Pls help.

Regards
Anandh