When you create report formats, Groups and graphs, you will drag and drop the relevant objects from the Object Browser into the respective dialog boxes. Once the cursor is in the right position, it changes to a + sign and you can drop the objects.
In the example below, the two pumps, p1 and p2, are dragged into a periodical report format. Report formats are defined using the Report Formats item in the Edit menu. Clicking the Browse button in the Report Formats dialog box, activates the Object Browser. The objects for the report format are selected and dragged into the report format.