Adding tags to displays is as easy as clicking and dragging. When a tag’s row is selected in the tag list, it appears in the tag field, just above the table.
Click and hold the left mouse button on the tag icon 
and then drag the mouse over a
PARCview display, such as a Trend. Let go of the left mouse button to drop the
tag. This icon indicates that the tag can be dropped on the object underneath
the mouse: 
Tags can also be dragged directly from the tag list onto displays. Select multiple rows by holding CTRL or SHIFT when clicking. Holding CTRL adds individual rows to the selection.
Holding SHIFT adds all of the rows between two selections.
From there, click and drag one of the blue highlighted tags and all of the tags selected will be dragged onto a display.