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Gradebook items that are not associated with a dropbox, quiz, or discussion are referred to as manually-created items. These items can be deleted from the Manage Grades More Actions menu.
Gradebook items that are associated with a dropbox, quiz, or discussion cannot be deleted from the grade book until the instructor has "unassociated" the assignment from the grade book.
Instructors who use the Percentage Grading option in a PLATO gradebook can choose to drop the lowest non-bonus items for a category where all items in the category have the same point value.