Use the System Data Management section in the Admin/Config menu to manage your master list of Volunteer Types and Volunteer Assignments which contain the assignment name, the work building, supervisor, and any notes.
Click the button for adding a new option to the list or click on the edit icon for modifying the details of one of the existing options. Before deleting an option, you will want to run a report to see if the option is being used in any of the volunteer records.