We're looking for a free app that is able to show variants/add on products already on our inventory. For example, we sell soap and we also sell soap tins, both have inventory tracking. On our soap product page we want to be have a variant/option to include a tin, but would like the add on tins to be taken from the general tin inventory, as opposed to creating a separate inventory for both.
If it's a generic shopify variant then we would also have to assign half the soaps to include tins and half to not, for inventory purposes. We want to just have one stock count for soaps, one for tins and the ability to provide the two as a bundle option on the product page..