You can enter any additional information about sizes to be displayed in the matrix view.
Exmaple of size descriptions with international size scales:
To enter size description go to Items -> Manage Items
Open the Size Setup tab.
Select a size and click Edit.
Modify the Description to show the text you want to display in the matrix view on the catalog.
For example: Multiple lines of sizes are supported for different countries:
You an also sort the order your sizes appear in the catalog - How to Sort Size Scale
The Boxes tab allows you to add Pre-packs. See Pre-packs and Assortments article for detailed instructions.