Hi Sridher,
In webi by using new data provider u create two queries with same data source So it can get in same report.Apply to filters in two queries.
1)In first query apply filter 1-4 city values
2)In second query apply filter 5-6 city values
Both qureies in the same report i.e you can get both pie charts in same report.Assign data to pie charts accordind to the queries.
I hope it will helpful to u.
thanks&Regards,
S