Add multiple calculating filters in MDX - filter

Question

I am really new to MDX but I have spent the past two days looking for an answer but failed. So I greatly appreciate your help and patience.
I am trying to query a Cube with filters on multiple dimensions, and I realize that there are many similar questions already there, like this or this.
The thing is, instead of specifying a particular content I am looking for, I am trying to set up filters that picks up all records that begins with a specific string. This requires left function in the filters (i.e. calculating filters?) but I cannot blend them nicely into the code.
My failed code is like this (the two filters should be in ANDrelation)
Select Non Empty ([Measures].[Sales]) ON 0
FROM [Cube_Name]
WHERE
(
FILTER
(
[Customer].[CustomerID].Members, Left([Customer].[CustomerID].CurrentMember.Name,4)="ABCD"),
[Product].[ProductID].Members, Left([Product].[ProductID].CurrentMember.Name,3)="EFG")
)
)
(My trial is based on the last answer here.)
I also read that there are some workarounds like CROSSJOIN WITH AGGREGATE or Sub-SELECT, but I just do not have any clue on 1)how to incorporate the conditions inside; 2) performance (I heard that CROSSJOIN can be slow).
I am not sure if I should mention it here, but I am actually implementing the MDX from Excel VBA by using the ADOMB.Cellset object. It only gives me the Grand total of the query I implemented under Cellset.Items(0) (there are no more items).
Thank you!

Answer 1

You need to split two sets into two filters:
Select
Non Empty [Measures].[Sales] on 0
From [Cube_Name]
Where
(
Filter(
[Customer].[CustomerID].[CustomerID].Members,
Left(
[Customer].[CustomerID].CurrentMember.Name,
4
) = "ABCD"
),
Filter(
[Product].[ProductID].[ProductID].Members,
Left(
[Product].[ProductID].CurrentMember.Name,
3
) = "EFG"
)
)