Product number dependent on product size in bundle

[bill_dawson]

Hi all,

First time posting - newbie here.

I want to create an option for my customers to buy a kit with for knitting a sweater.

The kit contains 1 or more different products from my inventory.

The customer chooses the size of the sweater (kit-level), and they choose the color of the yarn (product-level). The number of yarn balls is dependent on the size of the sweater. 

Here's an example of what I want to build: https://denlillegarnbiks.dk/products/haraboji-cardigan-garnkit

You can see from the link that the amount of yarn balls changes if you change the size of the sweater. 

How do I go about this - any ideas? 

Thanks,

Bill