Force Sell for WooCommerce plugin allows you to link products to another product, so they are added to the cart together.
Plugin Tag: product bundles
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WowRevenue – Product Bundles & Bulk Discounts
WowRevenue is a combination of product bundles and discount campaigns, including bulk discounts, buy x get y discounts, and more.
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YITH WooCommerce Product Bundles
YITH WooCommerce Product Bundles allows you to bundle WooCommerce products and sell them with a unique price.