Add Categories for the Assignments

The list of assignments for students in just one quarter is LLLLLLLLLOOOOOOOOONNNNNNGGGGGG. And I combined several activities into one assignment. Pleas allow us to add categories (for example I'd love to have each story as it's own category: "Don't Just Sit There LIke a Punk" and then all the activities for that story underneath it). Students are having a hard time finding the right assignment.