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You can put additional items at the bottom of an item's page. Such items are called accessories, and like items in groups, they don't have their own page. Everything about them (including their order button) appears on the page of the item that contains them.
Click the Store link.
Note: Accessories are leaf items. If an accessory is missing something, like the order button or image, check under Config on the Advanced Editor toolbar to make sure they have those variables selected in the Leaf-contents-elements field.