I am looking for this feature as well.
We have a few products that always have a base product that can be purchased standalone, but are in almost every case extended with add-on components (both built-to-order modules as well as general accessories). These components should also be visible in the shop and available for users to buy individually at later stage (with individual stock management), but for the initial product purchase it seems unreasonable in our case to expect shoppers to manually add multiple individual items to their cart to make up what would ship as one item. It must be as easy as selecting from a list similar to product combinations.
Accessories are too detached from the base product, packs are too constrictive, and combinations don't allow for easy stock management of individual attributes. I understand I can control stock quantities for EVERY combination, but I want to manage stock of each individual attribute separately and then have my store calculate whether a specific combination is available on demand.
For the life of me I can't see how to do this in PrestaShop. Any thoughts?