Upon activating the Group Registration plugin, a user has the option to purchase multiple courses during a single checkout.
WooCommerce
When the Individual purchase option is selected, the user is not given an option to change quantities of the product and this purchase will be made for a single user.
When the user selects Group purchase option, they are able to increase the quantity which is the total number of members that can be added to a group. With this option a group will be created for ‘1’ as the quantity.