Charts can be particularly useful when they display data that is different but complementary. Although it is certainly possible to show data in multiple charts, showing complementary data in the same chart allows direct comparison of information and more efficient use of space. The following steps will walk through a good example of this:
Start by opening the report Chap8BarChart.rpt. In the chart that will be added, bars represent the individual stores and a line shows the running total across all stores.
With the report open, right-click on the field Order Sales and choose Insert, Running Total. When the Create Running Total Field window opens, give the running total a name like Total Sales ...