In NX Drafting, you want to create a note (annotation) with a leader. There are two ways. First is more usefull if the annotation already exists. Edit -> Leader, select annotation to add the leader to, then select where the arrow should be placed. This can also be used to point one annotation to many areas.
The second way is to create an annotation with a leader in one step. Insert -> annotation, then select and hold the mouse button down where you want the arrow to be then drag off (you can release the mouse button now) then click again where you want the note to land.
Pretty cool trick.