Create variants with independent stock quantities

I carry one of a kind products and need to control inventory based off of one variant, even when other options are available. For example, I have necklaces with unique pendants, but customers can choose their chain style/length. So if the pendant variant #1 is chosen, then the chain style the customer chose as well as the other 2 chain options for pendant variant #1 need to go to 0 inventory. I’ve seen recommendations for Shopify Assistant to do this, but am wondering if there is any way to do this with editing to the liquid/theme?

Hi, did you get any answers for this?