The Tuplet tool allows you to create, edit, and adjust the positions of 
tupletsThe irregular division of notes into a given beat (i.e. 3 into 2). Includes triplets, quintuplets, septuplets, etc.. You can use the tool to describe the visual appearance of the tuplet (whether or not it has a bracket, for example) as well as its rhythmic definition (how many quarter notes in the space of a half note, for example).
You can predefine the default appearance of tuplets when you first create them (with the Simple Entry tool 
, Speedy Entry tool 
, or HyperScribe tool 
) including whether or not a slur or bracket appears, at what height it appears, and so on. To do so,
Tip: Change Tuplet settings over a selected region with the Selection tool 
. Choose Tuplets from the Change submenu of the Utilities menu.
