Hi Nicolas,
Thanks - it occurred to me to investigate 'related' products which I will do today.
However, although this subject is of particular interest to me because of what I want to achieve, I strongly feel that this is a potential 'feature' that should be considered for inclusion in future/current development. Other shopping carts seem to deal with the issue in a variety of ways such as 'Packs' etc. But the way I see it, the development of an efficient and effective method to administer and display 'Grouped / Bundled / Kits' product types would be a major enhancement and improvement to HikaShop Business edition.
I can see a new product 'Type' of say 'Group' or 'Bundle' with such a product type not having its own price but a group of associated products (similar to the current options) each with options / variants quantities (admin set defaults with customer override on the front-end). A single 'Add To Cart' button would add the chosen options/variants/quantities to the cart with each product and its options detailed in the order/invoice etc.
A merchant/customer friendly way to deal with the above would, imho, in conjunction with HikaShop's other excellent features (the flexibility of custom fields for example) make it stand out form the crowd!
Many thanks