In order to create a combo offer, please follow these instructions.
Go to Plugins in your dashboard and select “Add New”
Search for “WooCommerce Combo Offers”, Install & Activate it
Now when you create/edit a product you can choose the product type as “Combo Product”, then add many products as you want.
Just go to Products -> All Products -> and Add the new products to create a combo:
Choose Combo offer and create a name for it, add photos and other information you desire:
Under the Combo Products tab choose the products you want to add to your Combo offer and set the price for it:
Do not forget to put the country restrictions as well:
Done! Click Save and Go to the front end. Now your combo offer is visible in your products: