You can create a calculated measure that overrides the current dimension member. For example,
with member Measures.EnterpriseRevenue as (Measures.TotalRevenue, root([Customer]), root([Product]), root([Store]))
member Measures.PercentageEnterpriseRevenue as Measures.TotalRevenue/Measures.EnterpriseRevenue, format_string="#,#.00%"
Think about how you might look at time. For example, if a user is looking at 2013, then you might not want to override this to get the total for all time. But that's up to you. Also, you might want to cater for division by zero to return
null when EnterpriseRevenue is 0.
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