The options selectable in almost all the dorpdown lists (like student status, instruments etc.) used on MSM can be customised to what you need for your own music program.
To customise the options displayed for a dropdown list click on side menu option Settings and then on Selector Options. You will see a page with a list of tab for each dropdown list that can be customised.
On any of the lists, you can add additional options by clicking on the 'Add' button on the top of the list.
You can update any of the items by clicking on the pen icon next to the item you want to update.
You can delete any item on the list by clicking on the 'x' next to the item on the list you would like to remove.