I have a pivot table that looks a bit like this

              Month
Measure   Jul-06   Aug-06   Sep-06
Income      20        30          40

 Each month the data table that the pivot is based on has another
month's worth of data added i.e for the above example the income for
Oct-06 will be added.

 The problem is that in the above pivot I have manually gone into the
Month field and deselected 'All' and then selected 'Jul-06', 'Aug-06',
'Sep-06', so next month when October is added to the data the above
pivot will be unchanged i.e Oct-06 won't appear: what I want is a pivot
where only the most recent three months in the data field Month appear
in the pivot - is this possible without code??

Rgds
J