An additional quantity restriction is given by the possibility to compel the user to purchase the products as default groups, such as lots including 2,3 or 6 products.
Specify the number of groups to purchase the product in “Quantity groups of”.
According to the previous quantity restrictions, this option can be configured for all products in cart, or by categories, tags or on a product basis.
For Cart, category and tag restrictions, go to YITH > Minimum Maximum Quantity > Settings.
If you need to set quantity group restrictions on specific products, open the product edit page and set up the option in Minimum Maximum Quantity tab.