Take a hive with, say, four boxes. Likely about the bottom two will mostly be brood, the top two honey.
You could split that hive into four single-box hives, rearranging the frames to give each one all the things it needs to survive.
Each one needs a good number of workers, some reserves of honey, and some brood including eggs. In all but one of those new hives, the workers will pick some eggs or very new larvae from the brood comb you give them to raise a new queen.
