MDX Conditional/Dynamic Case Statement based on SSRS tuple parameter - reporting-services

Question

Is it possible to build a case statement (or equivalent) in MDX query to group together dimensional members based on parameter input from SSRS?
Below is a query showing roughly what I am trying to achieve (parameters have been commented out and hardcoded for testing) I'm afraid that I'm fairly new to mdx;
WITH
--PERIOD FOR COMPARISON BLOCK
SET [MonthNumber] AS
(
STRTOSET("[Date Procurement Created].[Month Number].&[9]"
--#DimCalendarMonthNumber
, CONSTRAINED)
)
--CONDITIONAL CASE BLOCK
SET [SelectedSuppliers] AS
CASE [Dim Supplier].[Supplier Name].CurrentMember
WHEN STRTOSET("[Dim Supplier].[Supplier Name].&[Flannels Direct Co Ltd],[Dim Supplier].[Supplier Name].&[Zucchini Trading Co]"
--#DimSupplierSupplierName
, CONSTRAINED)
THEN [Dim Supplier].[Supplier Name].CurrentMember
ELSE 'Other'
END
--CURRENT PERIOD BLOCK
MEMBER [Measures].[CP_LineTotal]
AS SUM(
([Measures].[Line Total],[MonthNumber])
), FORMAT_STRING = 'Currency'
--MAIN QUERY BLOCK
SELECT {
[Measures].[Line Total]
, [Measures].[CP_LineTotal]
}
ON 0,
NON EMPTY (
[SelectedSuppliers]
*[Dim Supplier].[AC Number].[AC Number].MEMBERS
*[Date Procurement Created].[Year Name].[Year Name].MEMBERS
)
ON 1
FROM
[TRANSACTION_PROCUREMENT]

Answer 1

I think this part of your code could change to the following:
SET [SelectedSuppliers] AS
IIF(
[Dim Supplier].[Supplier Name].CurrentMember
IS [Dim Supplier].[Supplier Name].&[Flannels Direct Co Ltd],[Dim Supplier].[Supplier Name].&[Zucchini Trading Co]
,[Dim Supplier].[Supplier Name].CurrentMember
,'Other'
)
IIF should always be used rather than CASE if possible.
Use the IS operator to compare members.
Also no need to use Sum in your definition of the measure as a simple tuple will suffice:
MEMBER [Measures].[CP_LineTotal] AS
([Measures].[Line Total],[MonthNumber])
, FORMAT_STRING = 'Currency'