To be able to sell your products in your events, they must first be gathered into Product groups. Products groups are then added to the events.
Once a product group has been created you can access its detailed view, where products and events / event templates can be assigned to it.
You may also organize Products groups into categories.
Detailed view of a product group
In the Event level version of the Product groups submodule, you will find the Product groups that have been added to the event.
With the Actions menu, you can add a dependency to the Product group, so its products can only be purchased by specific groups of participants (e.g. If a dependency with the field "Sponsored participants" is added, only those who are Sponsored participants will be able to purchase the products in the shopping cart, on the event website).