Hi Dafydd,
Greetings for the day!!
We can do this by making variants of the products. But we can make only 100 variants max, as it is shopify limit to make variants. If the total of variants are less than 100 then we can do like that.
Please add me over s k y p e ofr detail discussion. My id is c i s (dot) l i s a
Awaiting for your reply.
Regards,
Lisa