You can insert a new report as a subreport, or you can insert an
existing report as a subreport.
The process for creating a subreport is similar to the process of
creating a regular report. A subreport can have most of the characteristics of
a report, including its own record selection criteria.
A subreport can be placed in any report section and the entire subreport
will print in that section. However, a subreport cannot stand on its on; it is
always inserted as an object into a primary report.
Note: You cannot insert a subreport into another subreport.