Selecting multiple components
Helm generally follows normal Windows user-interface rules. There are several ways to select more than one item simultaneously:
Select with marquee (rectangle)
Click and drag in the work area and a dotted rectangle (marquee) follows the cursor. All items that are inside or intersect the marquee are selected.
Holding down the Shift key and clicking on items adds and removes them from the selection set. If you shift-click on a selected item it becomes selected and vice-versa.
Right-clicking on an item brings up a menu. If you choose the Select Similar command objects of the same type are selected.