In a large bowl combine sugar, salt, celery seed, oil, vinegar, and pepper. Add cabbage and stir to combine.
Place the brats and beer into a large deep skillet and bring to a boil over high heat. Reduce heat to a simmer and cook until the brats are fully cooked (about 20 minutes). Heat an outdoor grill to medium-high heat. Remove the brats from the beer and grill until browned on all sides.
Place the brats into the hoagie rolls and add some of the slaws.