Ihave had a lot of crystallized honey. When it is summer and bees do not get honey from field, you can broke the caps of cells and you put a frame or two in the middle of brood area.
Bees lick the honey away and store it to upper parts of hive.
If you do that when honeyflow is on, bees will cap again the honey. Rainy days are good for operation. Every week you can put 2 frames per hive and it is OK.
You can help bees so that when they lick liquid part of honey away, you spray water quite a much on krystals. So bees are able to lick sugar. Often they begin to carry out sugar. They think that it is rubbish. So give water on, and everything goes well.