Looks like you might be able to use "Unit of Measurement Groups" found at Administration -> Setup -> Inventory -> Unit of Measurement Groups.
Define them using the base UoM's like a "a Box of 10" and "a Pallet of 200" and then assign the group to the item.
You could name your UoM's like "a Box of 100" so you can use them on other items.
Play around with those ideas and see if you can come up with something that will work.