To Associate Virtual Items to the Virtual Item Group

Open the virtual item group in the Content pane.
Expand the Virtual Item Members topic.
Click the Query Virtual Items link to search for the virtual item(s) you want to associate to the virtual item group. From the search results, drag the virtual item(s) onto the Virtual Item Members topic.
Repeat this step until all structure elements for the displayed virtual item group have been established.

Tip: Click the Delete icon next to any item to remove it from the virtual item group.

Note: You can also structure virtual item groups by dragging the parent virtual item group to the whiteboard area in the Explore Focus pane. Follow this by dragging virtual item(s) onto the parent virtual item group or onto existing virtual items to define further levels.