Advanced grouping options.
You aren't limited to one level of grouping within Crystal Reports. You can have groups within groups.
For example, you can have a report of all customers, broken down by country, and each country in turn broken down by region. You could even go further and have a third level, by city.
To create nested or multiple groups, follow the same steps that you did when you created the first group on your report.
Note
As you add more groups, they're automatically added to the list in the Sort Fields area of the Record Sort Order Expert.