Bands of a specific report are contained in the BandCollection instance, accessible by the report's XtraReportBase.Bands property. This collection and its items can be modified in different ways.
Design time
Select a report, open the Properties pane and click the ellipsis button for the XtraReportBase.Bands property. This will invoke the Report Editor dialog, which displays a hierarchical tree of report bands, and is intended for adding or removing bands, as well as editing their public properties.
Design time
Another way to invoke the Report Editor dialog is to choose the Edit and Reorder Bands... option in a report's smart tag. Note that this smart tag is shown in the top left corner of the report designer, when a report gets focus at design time.
And the same option is available via each band's smart tag as well.
Design time
If you want to simply add a new band of a particular type, you may use the report's context menu for this. Right-click a report's area at design time, as shown in the image below, and you'll be able to insert new bands into the report.