WooCommerce Category Discount - Modify discount amount in Cart Details

wcd_disc_amt_cart_details.php

<?php

function wcd_disc_amt_cart_details_func($disc_amt, $data, $item){

	return $disc_amt * $item['quantity'];
}

add_filter('wcd_disc_amt_cart_details', 'wcd_disc_amt_cart_details_func', 10, 3);