Exel Data Grouping

How do I design a JetReport that subtotals amounts for a vendor at every change in vendor no.?

A similar question is how do I design a JetReport that provides a total count of every item for a particular vendor no.?

Currently, I only can perform this Excel feature once the JetReport is run. I don't know how to set-up the JetReport in the design mode so that it automatically subtotals when it is run.



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