Ascendants

The Ascendants functionality gives back all levels from and including the current level.
SELECT
   Measures.[Sales Amount] ON COLUMNS,
   Order(
      Ascendants(
      [Product].[Product Categories].[Product].&[448]
      ),
      DESC
   ) ON ROWS
FROM
   [Adventure Works]
where ([Date].[Calendar Year].&[2012])
Will give us:

Have Fun And Till Next Time