For this company, there are PRIMARY PRODUCTS (generators) and related ACCESSORIES. All primary products have free shipping, and accessories have a shipping fee UNLESS they are purchased with the primary product, because they will ultimately ship attached to the primary product.
PRIMARY PRODUCTS have multiple Model#'s and certain ACCESSORIES can be compatible with multiple Model#s - so we'll need multi-selelect for that when creating accessory.
Primary Products have all the following fields below: We'd want to use the dropdowns where you choose from existing values or use + to add new value, so people don't just randomly add variations of things.
Associated Accessories (tied to Model#s)
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