Hi janmagnuszews
To achieve what you want, you can use our Product Levels add-on.
With it, you can link BOM products to multiple "final" products, and, once one is sold, the stock of the other products sharing the same BOMs will be adjusted accordingly.
But, please note that ATUM is only compatible with the official WooCommerce Product Bundles plugin at this time.
Best Regards,
Salva.