WooCommerce: If you are using Calculation Mode as Per Item/Per Category/Per Shipping and would like to offer a free shipping based on order value.

functions.php

	add_filter('woocommerce_package_rates', 'wf_remove_shipping_pro_rate_when_free_shipping_is_applicable', 10, 2);
	
	function wf_remove_shipping_pro_rate_when_free_shipping_is_applicable($rates, $package)
	{
		if (isset($rates['free_shipping'])) {
			foreach($rates as $ratekey => $ratevalue) {
				if (strpos($ratekey, 'wf_woocommerce_shipping_pro:') !== false) {
					unset($rates[$ratekey]);
				}
			}
		}
	
		return $rates;
	}