In addition to a visual representation of
the hierarchy inherent in your data, a
Crystal Reports report that you have grouped hierarchically
has several other characteristics:
When you drill down on a group in the
hierarchy, the drill-down view also shows the records that are lower in the
hierarchy.
The report contains hierarchical group
footers that include the records that are lower in the hierarchy of each group.
You can summarize data across the hierarchies.
Note: You cannot use
hierarchical summaries in formulas.