- Choose Engrave > Edit Noteheads.
- In the category list on the left, click the + to create a new notehead set.
- On the right, in the ‘Name’ field, call it e.g. ‘Cluster top’.
- Click the + button at the very bottom of the dialog on the right-hand side in the action bar at the bottom of the ‘Notehead’ section to add a new default notehead to the notehead set. A new black notehead is added to the set.
- Make sure the first notehead is selected in the grid, and click the button that has the arrow pointing out of the container, the button on the right, whose tooltip is ‘Remove Notehead From Set’, to remove the default notehead from the set, leaving only your new notehead.
- Now click the pencil icon in the action bar in the ‘Notehead’ section at the bottom of the dialog to edit the notehead.
- From the ‘Note Clusters’ category, add the cluster top notehead.
- Select the existing notehead that was already there, and click the trash can icon to remove it.
Now repeat steps 1-5 to create the ‘Cluster middle’ notehead set. When you come to steps 6-8, choose the cluster middle notehead from the ‘Note clusters’ category.
Now finally repeat steps 1-5 once more to create the ‘Cluster bottom’ notehead set. When you come to steps 6-8, choose the cluster bottom notehead.
You may also want to add the white/open notehead versions for half notes and whole notes to all three of your notehead sets. In each case, start by clicking the + button at the bottom of the dialog in the ‘Notehead’ section, rather than editing an existing notehead that is added to the notehead set by default.