Sub-sections are the additional sections that can be added to any section of a report. A FlexReport generally contains - Detail, Header, Footer, PageHeader, Page Footer, Group Header and Group Footer - sections as described in Sections of FlexReport.

Each of these sections contains atleast one sub-section, but you can add as many sub-sections in a section.

To add a sub-section in the Header section of a report, the following code should be used:

 'create a subsection in the header section
     Dim ss As SubSection = C1FlexReport1.Sections.Header.SubSections.Add()
  'set height to 10 mm
     ss.Height = 10 * 1440 / 25.4

//create a subsection in the header section
   SubSection ss = rep.Sections.Header.SubSections.Add();
// set height to 10 mm
   ss.Height = 10 * 1440 / 25.4;