Have you seen the Related Products example already?
https://support.wix.com/en/article/adding-a-related-products-gallery-in-wix-stores
Or by doing it yourself through Wix Code?
https://support.wix.com/en/article/corvid-tutorial-adding-a-related-products-area-to-a-wix-store-product-page
Video to walk you through the tutorial itself.
https://www.wix.com/corvid/tutorial/how-to-add-related-products-to-a-wix-stores-product-page