Changing amount issue in Woocommerce. Home » Components » Changing amount issue in Woocommerce. February 23, 2017 Javo Components, Plugins, Troubleshooting No Comments If you want to use order amount option, you need to install this plugin. https://wordpress.org/plugins/woocommerce-quantity-increment/ WooCommerce Quantity Increment There might be an issue which you can’t change quantity without this plugin. Once you install this plugin, it will be fine.