ShipStation does not have a product kit or bundle feature for product records. However, certain selling channel platforms can send product kits or bundles to ShipStation so they display the bundle within the order details.
If your selling channel platform does not do this automatically, you must configure it on the selling channel side. In come cases (for example, WooCommerce), you'll need to install an additional plug-in for this ability. For more details, contact your selling channel support team.