HP Intelligent Management Center Standard Software Platform - Manual (Page 235)

7. On the Report menu, click Hierarchical Grouping Options.
8. In the Available Groups list of the Hierarchical Options dialog box, select
the group you want to organize hierarchically.
9. Select the Sort Data Hierarchically check box.
10. In the Parent ID Field list, select the field by which you want the Instance
ID Field organized.
For example, for an employee hierarchical report, you might select the
data field listing the supervisor to whom the employee reports.
Note:
The Instance ID Field and Parent ID Field must be of the same data type.
For example, if the Instance ID Field holds string data, then the Parent
ID Field must also hold string data.
Crystal Reports 2008 SP3 User's Guide 235
10 Sorting, Grouping, and Totaling
Grouping data