1. The cart can provide a component breakdown to Integration Manager with the order. In this case Integration Manager can be configured to load the kit components instead of the kit main SKU.
   
2. The WMS or Order Destination can understand the kit SKU and be set up to understand which components to ship.
   

The same requirement applies in reverse for Inventory syncing to carts. Integration Manager will sync inventory to the cart for whatever SKUs the WMS provides, whether or not they are kits, as long as the SKU matches.