HI chimpchimp ,
Thank you very much for your post.
This is what we call bill of materials and it covers our Product Levels premium add-on.
Your product is a raw material that you set stock of for example 100. Then in each variation, you attach the correct amount ATUM has to deduct when one variation sells.
In your case:
1pcs variation = 1 x Raw (when one sells one raw will be deducted)
6pcs variation = 6 x Raw (when one sells six raws will be deducted)
and so on.....
As the stock depletes the variation that cannot be fulfilled gets an out of stock message unless you chose otherwise.
Example: stock of Raw goes down to 10, your front end will show (again according of what you set in Product levels as you have many options. Documentation is on the main page of this forum.)
Variant one - 12 in stock
Variant two - 1 in stock
Variant three - Out or on back order.
Hope this helps.