Hi Ryan,
Thanks for your question.
You can just write the filter in the sub select statement.Take cube Adventure Works as an example, if you select calendar year 2012 and 2013 for filter calendar year, and select Seasonal Discount,Volume Discount and New Product for filter Promotion Type,
then you can try MDX query below:
SELECT
{ [Measures].[Reseller Sales Amount] } ON COLUMNS,
NON EMPTY { ([Product].[Category].[Category].ALLMEMBERS ) } ON ROWS
FROM
( SELECT { [Date].[Calendar Year].&[2012], [Date].[Calendar Year].&[2013] } ON COLUMNS
FROM (
SELECT { [Promotion].[Promotion Type].&[Seasonal Discount],
[Promotion].[Promotion Type].&[Volume Discount],
[Promotion].[Promotion Type].&[New Product] } ON COLUMNS
FROM [Adventure Works]
)
)


Best Regards
Willson Yuan
MSDN Community Support
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