WITH MEMBER [Measures].[prev] as '
   ([Applies To Date.All Periods].CurrentMember.PrevMember)))
'
SELECT
 {Hierarchize({[Measures].[Available], [Measures].[prev]})} ON COLUMNS,
 {Hierarchize({{[Applies To Date.All Periods].[year].Members}, {[Applies To Date.All Periods].[quarter].Members}, {[Applies To Date.All Periods].[month].Members}, {[Applies To Date.All Periods].[day].Members}})} ON ROWS
FROM [Inventory]
WHERE ([Event].[testEvent], [Price Level].[testLevel])