Getting Life to Date values

Hi there folks,

I am trying to do a BEx query and the requirement is to show life to date values for orders along with the respective fiscal period values. What is the best way to achieve this so that only records for selected fiscal period are displayed but along with Life to date values?

Here is a rough layout of the query:

Order#          Fiscal period               $costs         $costs (life-to-date)

10001111           001.2012                 5,000             50,000

10001111           002.2012                 5,000             50,000

10001112           001.2012                 6,000             30,000

10001112           002.2012                 7,000             30,000

10001112           003.2012                 7,000             30,000

10001113           003.2012                 5,000             10,000

Appreciate your comments regards how to handle this.

Thanks!