YITH WooCommerce Product Bundles is an extension conceived to create bundles with the combination of some products of your shop. You can assign an ad-hoc price to the bundle or a price given by the sum of the single elements contained in the bundle itself.
By using it in combination with YITH Cost of Goods, you can add a cost of goods to your bundle products.
After installing and activating both plugins, a new field will be added to the bundle option in the product edit page as shown in the image below. Here, you can enter the value expressed in your currency.
For further details about YITH WooCommerce Product Bundles settings, please refer to the official documentation.