It's common for some more complex formulas to be combined to provide specific insight into report data. For example, a user might need to have a report that lists all customers with their total sales, but also show the average value of sales over a given amount. As described previously, there are many ways that a report design expert can approach this; what follows is one method.
Open the report Chap3RunningTotal.rpt. Insert a group on Customer ID. Select the running total field, right-click it, and choose Edit Running Total. Under the Reset section, choose On Change Of Group. Now the report is ready for the new functionality and should look like Figure 3.9.
Figure 3.9. This is the starting ...