Woocommerce Tweak Classes With Filters and Hooks

I’m developing a woocommerce custom extension to a customer requested me with some functionallities.

I need override some functions inside the class_wc_order.php file, but i don’t want edit the file directly, i want do it through an extension or well as function in the theme.

This is the idea:

<?php
require_once(ABSPATH .’wp-content/plugins/woocommerce/classes/class-wc-order.php’);

class WC_Order_Custom extends WC_Order{

public function __construct( $id = ” ) {
parent::__construct( $id = ” );
}

public function reduce_order_stock(){
// code goes here
}

}

My intention is, use the reduce_order_stock function that i created instead the original, at the moment to generate the orders, but i’m stucked there, i need figure out it soon.
How can i do it with filters and actions?

Thankyou for your help and time.