E-Commerce Configuration Guide : Site Configuration Settings : Item Settings : ModifierSort
 
ModifierSort
Key value:
Field from items table followed by either asc or desc.
Description:
Used to specify the field (from the items table) and sort order (ascending or descending) of item modifiers that display on the ItemShow.aspx page. The first argument of what is entered for value is a field from the items table. The second part sets the sort order and can either be asc for ascending or desc for descending.
 
Note: Most but not all fields from the Items table can be used here. Test the field you wish to use before deploying in a live environment. If the field is not available for use, you get an error stating that the column cannot be found.
 
Example:
ModifierSort = descrip asc
See also:
ModColLen
ShowOptionalMods