If you are trying to count the number of dimension members via MDX, where your measure is [Measure].[Item Quantity] and dimension is [Item].members, you can write your MDX query as:
with
member [Measures].[blah] as ‘Count(Crossjoin({[Item].members}, {[Measures].[Item Quantity]}), EXCLUDEEMPTY)’
select {
[Measures].[Item Quantity], [Measures].blah
} on columns, {
[Item].children
} on rows
from [Cube]
member [Measures].[blah] as ‘Count(Crossjoin({[Item].members}, {[Measures].[Item Quantity]}), EXCLUDEEMPTY)’
select {
[Measures].[Item Quantity], [Measures].blah
} on columns, {
[Item].children
} on rows
from [Cube]
Denny Lee 