Setup Options: Displaying product SKUs in the cart
You can enable the SKU for each product to show on the cart page.
Click on the ‘Settings’ button in the top right-hand corner of the Bundle Builder app and click on ‘General’.
Then enable the checkbox for Show SKU, and Save.
Individual product SKUs should also show up by default in the 'Orders' section of your Shopify admin when someone places an order for a bundle.