A made-to-order frame demoing AWP's connected attributes: Frame Material and Print Size are connected, so the price, SKU, and stock come from each material + size combination instead of the individual choices. Walnut in 16 x 20 is marked unavailable and Oak 16 x 20 runs low stock, so you can see how the matrix drives availability. Hanging Hardware is a grouped attribute: every add-on shares one price and one stock pool.