Grouping SSAS members into buckets using MDX - ssas

Question

SSAS and MDX newbie here.
If I have an SSAS cube with Geography, Product as the dimensions and total sales as a measure.
The following elements are under geography:
EAST
WEST
NORTH
SOUTH
MID-ATLANTIC
MOUNTAIN
NORTH-WEST
Products are:
1
2
3
4
For Product ID = 1, is there a way I can group some members into a "rest of the country" bucket and aggregate the sales?
Meaning, the expected output is:
Product ID Geography Sales
1 East 100
1 West 200
1 North 300
1 South 400
1 RestOfNation 1200
2 East 100
2 West 50
2 RestOfNation 1500
Is there a way I can buck some members into "RestOfNation" using an MDX query?

Answer 1

You could try something like this.
Create a named set made up of the members that you'd like to throw into the bucket RestOfWorld.
Make a member, within the geography dimension, that is the aggregation of the rest of world members.
Find the countries that are not in the rest of the world set.
Here is a script against AdvWrks (worth installing as it is a common prototyping tool when playing with mdx and posting to forums):
WITH
SET [RestOfWorld] AS
{
[Customer].[Customer Geography].[Country].&[United Kingdom]
,[Customer].[Customer Geography].[Country].&[Germany]
}
MEMBER [Customer].[Customer Geography].[All].[RestOfWorld] AS
Aggregate
(
{
[Customer].[Customer Geography].[Country].&[United Kingdom]
,[Customer].[Customer Geography].[Country].&[Germany]
}
)
SET [CountriesMinusROW] AS
[Customer].[Customer Geography].[Country].MEMBERS - [RestOfWorld]
SELECT
NON EMPTY
{[Measures].[Internet Sales Amount]} ON 0
,NON EMPTY
[Product].[Category].[Category]
*
{
[CountriesMinusROW]
,[Customer].[Customer Geography].[All].[RestOfWorld]
} ON 1
FROM [Adventure Works]
WHERE
[Date].[Calendar Year].&[2007];
The above gives the following cellset: