App Selly can help you to create bundles which adds individual SKUs to cart:
Hi there, we recently launched Simple Bundles that allows you to see which SKUs were sold as part of a bundle. This way, you can track each SKU individually and also use the info to your 3PL logistics partner for picking and packing. For example, if you have 3 SKUs in a bundle, you would see 4 line items (1:bundle SKU + 3:bundled products/SKUs).
Would love to hear any feedback so we can continue to make improvements and add features.