WooCommerce Product Addons module lets you create addons for WooCommerce products. Label and price can be set for each addon. Addons can be added globally or per product. Price can be less than zero, in which case it will give a discount to your customers.
Global (all products) Addons
To create addons globally, i.e. same addons for all products, go to WooCommerce Product Addons module settings in WooCommerce > Settings > Booster > Products > Product Addons. Set number of addons you want to create and save changes. After that you can set label and price for each addon.
First you need to enable per-product addons in module’s settings (WooCommerce > Settings > Booster > Products > Product Addons).
After that go to selected product’s edit page. There you will find Booster: Product Addons metabox. After setting total number, update product. As in case with global addons, you will need to set label and price for each addon.
You can disable AJAX for both global and per-product addons (i.e. price won’t be changed dynamically and customer will see total price for product with selected addon, only when product is added to cart).