Precalculation - variable/variant setting

Hi Gurus

I got a requirement to pre-calculate and publish a web template in a portal. This web template is having 3 query views (all these query views are on the top of same query). I want to schedule it every day with selection screen value (creation date) as yester day's date and for another template with last week.

Is there any way to change the value of my variant using some program so that I will not have to schedule it every day by changing the selection screen value? I checked the table RSRVARIANT but I can not see the variant created in the WAD.

We are in BI 7

Thanks in advance

nisha