Multiple charts from stored procedures

We are using BIRT 3.7.1 with MSSQL 2008 R2.

We have an application that asks several question with all answers posted to an Answer's table with information about the instrument instance, the question, and the answer.

We need to report the results in a report that shows the data in charts using various selections and aggregations.

I created a stored procedure that returns a superset of the data needed for a specific instance.

What is the best approach (maintainability with reasonable execution time)"

Create a stored procedure that does the selection and aggregation for each chart?
Use the superset stored procedure in multiple datasets?
Other?

Thanks,

Dave


(I also put this topic into the Eclipse forum by mistake. Sorry for any confusion - I don't know the relationship between the forums)