New column - all-time rolling sum in Repository

Hi all
I need to build a new column in the repository.(ALL TIME ROLLING SUM TO DATE) and # Month Roll over on that.
I am looking for a way to easily compute rolling sums (etc.) for ranges of dimensional values that are not included in the result set.
I want to show a table of monthly unit count for 6 months:
I have the values forall months ,starting from years 2000.
Month unit Count
Jan07 100
Feb07 150
Mar07 - 100
Apr07 125
May07 - 200
Jun07 210
In another column I want to show an all-time rolling sum of the transaction activity
(sum the metric for all rows in the fact table <= the month in the row of the report).
Month Unit Count Rolling Sum To Date (Balance) 3 month Rollover
Jan07 100 3400
Feb07 150 3550
Mar07 100 3650 10600
Apr07 125 3775 10975
May07 200 3975 11400
Jun07 210 4185 11935
I tried RSUM for Rolling Sum To Date, but it dosent give rolling sum values above the considered result set time period.
Immediate help is appreciated, kind of urgent help required.
Thanks in advance.
Edited by: user11939829 on Sep 16, 2010 10:20 AM

Hi Deepak,
When i gave the example i forgot to add that i am showing the pivot chart in the report and showing the RSUM in Line Graph for 3 years..where i have year at the column and i have one dimension at the page section of the prompt.
So i m just showing the line graph where i have RSUM at the Vertical axis...Month at the horizontal Axis.
Sorry for the confusion

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