Say you have a bedroom set with variant options of:
Curtain sizes: A, B, none
Bedding size: A, B, none
This allows you to purchase either/or .. you can buy curtains, or you can buy bedding, or both .. the problem is that it allows you to buy neither/none and it displays the price as From: 0.00.
Example: Bedding Set (none, none) - £0.00
Is there some clever way around this? Do other e-commerce systems allow products within products but prohibiting certain combinations or what?