To erase everything from a selected region
Click the Selection Tool 
and select a region. See Selecting music for some region-selecting shortcuts.
Press the Backspace key or select Clear Entries and Smart Shapes from the Edit Menu. NotePad erases all music, leaving empty measures behind. (If you want to remove the measures too, press the delete key instead.)
To erase a note, rest, or chord
Click the Simple Entry Tool 
. The Simple Entry Palette appears.
Click the Eraser then click above or below the note. The note disappears. If you click on a notehead that’s part of a chord, only that note disappears. If you click a rest, it disappears.
