Hi @made4Uo
Thank you for your answer. I appreciate it.
I add two custom fields above “add to cart” button, so customer can put their custom basket size. I put the size option within a range.
For example if you wanted ( 35cm width + 50cm height = the total size would be 85cm) so you would choose option, range 81 - 90cm for pricing.
The purpose is to make it easier to the customer, when they put they size they want, the system will count and chose the right option for them. Is it possible to do it by just using variant option on each product?