A sub-report is a report definition that provides some or all of its results to another report definition that invokes it. Using a report definition as a sub-report does not change it in any way, and the original report can still be accessed directly in its own right.
Users can designate sub-reports within report definitions to simplify assembling data from several classes, or to satisfy complex conditions.
For example, the requirements for a report might state: "For each operator, show information (ID, label, status, last update) for the last work item they updated within a given work type." A way to accomplish this would be:
Version 5.5 (list view and summary view) reports cannot serve as sub-reports.