Understanding subreports in report templates
You can use subreports to show multiple types of objects for each contact, company, group, or opportunity in a report. For example, to display the notes and histories for each contact, you can create two subreports, one for notes and one for histories.
When you add a subreport to a template, you create a report within a report. A subreport contains the same basic information as a regular report, such as the five default sections, that you can modify by adding fields and objects and specifying options. For information about sections, see Understanding sections in report templates.
By default, the five default sections associated with the subreport are hidden. You can change the settings for the sections to make them visible, and then you can select the information you want to display on the subreport.
How do I...?
Add a subreport to a report template
Viewing a subreport from a report template