This can be used where there is a requirement to group products based on 2 separate product attributes, on one page.
The Size Groups are created automatically by the Get Products API, if the Size Group field is populated in the ERP system.
E.g. Trousers
One style of trousers are sold in a number of waist sizes, and also number of legths.
The Size Grouping provides the 2nd grouping parameter, in this example the "length", to display a "Size-Matrix".
Example:
See also: Product Variations, Search Filters