Описание тега subreport
A report that is inserted into another report, usually to provide more detailed information on repeating items.
If a report contains repeating items (for example, a list of employees), a subreport may be used to include additional information for each of those items (for example, sales per employee).
This is especially useful if the additional data does not come from the same data source as the items used for the main report. Also, the subreport may be re-used across multiple main reports.