Selected objects can be grouped and ungrouped.

To group objects, select them either :

by holding down the left mouse button and dragging across the objects

or by left-clicking on one object then right clicking on others to add them to the selection. (Right clicking on selected objects deselects them)

When the objects required are selected, press Ctrl + G or select Group from the Edit menu. A single red bounding box appears round the grouped objects, which can now be moved, scaled, copied etc. as one.

To ungroup objects, select the group then press Ctrl + U or select Ungroup from the Edit menu.