Usage patterns
〈物〉は〈事〉の部類に入るX falls into the category of Y
He falls into the category of excellent people.
〈物〉は〈事〉の部類に属するX belongs to the category of Y
This fish belongs to the category of high-grade fish.
〈物〉を部類に分けるto divide things into categories
I divided the books into categories according to their content.