A subreport is a report within a report. 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. The only differences between a subreport and a primary report are that a subreport:
Is inserted as an object into a primary report; it cannot stand on its own.
Can be placed in any report section and the entire subreport will print in that section.
Cannot contain another subreport.
Does not have Page Header or Page Footer sections.
There are instances in which a subreport would typically be used:
Note: You can increase the performance of reports containing subreports by using on-demand subreports instead of regular, in-place subreports.