Well, if you want to get Energy Revenue - Utility Revenue you could write MDX to do it. You can either create [Energy Revenue], [Utility Revenue], and [Energy - Utility Revenue] which subtracts the two calculated measures, or you can alternatively just create the [Energy - Utility Revenue] and write the MDX to calculate it. In example:

WITH MEMBER [Energy - Utility Revenue]

AS

([Measures].[Total Revenue], [Dimension Sector].[Sector Group].&[Energy])-([Measures].[Total Revenue], [Dimension Sector].[Sector Group].&[Utility])

SELECT [Measures].[Energy - Utility Revenue] ON COLUMNS

FROM [EUS Fin Mart]