Are you looking for the code where you can change Woocommerce Group Pricing with variations and Quantity Select. You need to do the custom code for this.

Here is simple trick for you.

Add following code in / wp-content / plugins / woocommerce / templates / single-product / price.php

Here is a code for Price.php

<?php
/**
* Single Product Price
*
* This template can be overridden by copying it to yourtheme/woocommerce/single-product/price.php.
*
* HOWEVER, on occasion WooCommerce will need to update template files and you
* (the theme developer) will need to copy the new files to your theme to
* maintain compatibility. We try to do this as little as possible, but it does
* happen. When this occurs the version of the template file will be bumped and
* the readme will list any important changes.
*
* @see https://docs.woocommerce.com/document/template-structure/
* @author WooThemes
* @package WooCommerce/Templates
* @version 3.0.0
*/

if ( ! defined( ‘ABSPATH’ ) ) {
exit; // Exit if accessed directly
}

global $product;

?>
<p class=”price”><?php echo $product->get_price_html(); ?></p>

Also install  The Plugin

WooCommerce Product Price x Quantity Preview

https://wordpress.org/plugins/woo-product-price-x-quantity-preview/

Once you add this code you can see the product Pricing getting changed with the variation and quantity selection.