Linked products

For single product

• To add linked products follow: admin bar→ Products→ Edit product.
• In Product Data metabox open the Linked products tab.
• Add products to Linked Products, that can be removed or Linked Products, that can be removed only with the current product field.

For products in category

• To add linked product to category follow: admin bar→ WooCommerce→ Force Sell.
• In the Categories block select category in dropdown menu and click Add Category.
• In the table, add products to Products Added field.
• Check Linked if products can be removed only with the added product.

For products list

• To add linked product to list of products follow: admin bar→ WooCommerce→ Force Sell.
• In Products click Add Product.
• In the table, add products to Products field. Those are products list.
• In the table, add products to Products Added field. Those are products that will be added to products from Products field.
• Check Linked if products can be removed only with the added product.