This wizard page is no longer used in the default Report Wizard implementation. The following master-detail page is used instead: Create Groups (Multi-Query Version).
You can switch back to using the standard Report Wizard version in your Web application by disabling the ReportDesignerWizardSettings.UseMasterDetailWizard option.
On this page, you can create groups in your report. When this is not required, you can skip this page by clicking Next.
The following image illustrates how nested grouping and grouping against multiple fields work.
You can stop the wizard at this step by clicking Finish.
To continue report customization, click Next to proceed to the next wizard page.