Add custom data to cart & order in WooCommerce using filters

//*****---  Remove Eicons:  ---*****
//==========================
add_action( 'wp_enqueue_scripts', 'remove_default_stylesheet', 20 ); 
function remove_default_stylesheet() { 
	wp_deregister_style( 'elementor-icons' ); 
}

/***** Shorten Post/Page link  *****/
//============================
add_filter( 'get_shortlink', function ( $shortlink ) {
    return $shortlink;
});

<script>
jQuery( document ).ready(function($){
	$(document).on('click','.elementor-location-popup a', function(event){
		elementorProFrontend.modules.popup.closePopup( {}, event);
	})
});
</script>

<object data="PDF URL" type="application/pdf" width="700px" height="1200px">    
<embed src="PDF URL" />    
</object>

<!-- Get all tags displayed -->
    <nav class="all-tags">
        <ul>
            <?php
                $tags = get_tags('post_tag'); //taxonomy=post_tag
        
                if ( $tags ) :
                foreach ( $tags as $tag ) : ?>
                    <li class="tags">
                        <a href="<?php echo esc_url( get_tag_link( $tag->term_id ) ); ?>" 							title="<?php echo esc_attr( $tag->name ); ?>">
                        <?php echo esc_html( $tag->name ); ?>
                        </a>
                    </li>
                <?php endforeach; ?>
            <?php endif; ?>
        </ul>
    </nav>

$( ".variations_form" ).on( "woocommerce_variation_select_change", function () {
    // Fires whenever variation selects are changed
} );

$( ".single_variation_wrap" ).on( "show_variation", function ( event, variation ) {
    // Fired when the user selects all the required dropdowns / attributes
    // and a final variation is selected / shown
} );

<?php

if( have_rows('your_group') ): while ( have_rows('your_group') ) : the_row(); 

    if( have_rows('your_repeater') ): while ( have_rows('your_repeater') ) : the_row();       

        echo get_sub_field('repeater_sub_field');

    endwhile; endif;

endwhile; endif;

?>

/**
*   WooCommerce woocommerce_order_item_line_item_html action hook registeration.
*/
add_action('woocommerce_order_item_line_item_html', 'woocommerce_order_item_line_item_html', 1, 3);


/**
* Callback Listener for customised line item functionality in the admin.
*/
function woocommerce_order_item_line_item_html($item_id, $item, $order){
    // Add your custom line item functionality.
    // A good example would be order fulfillment for a line item.
}

add_filter( 'woocommerce_product_get_stock_quantity' ,'custom_get_stock_quantity', 10, 2 );
add_filter( 'woocommerce_product_variation_get_stock_quantity' ,'custom_get_stock_quantity', 10, 2 );
function custom_get_stock_quantity( $value, $product ) {
    $value = 15; // <== Just for testing
    return $value;
}

    $_product = wc_get_product( $post_id );

    if( $_product->is_type( 'simple' ) ) {
    // do stuff for simple products
    } else {
    // do stuff for everything else
    }

add_filter( 'woocommerce_checkout_fields', 'alter_woocommerce_checkout_fields' );

function alter_woocommerce_checkout_fields( $fields ) {

  unset( $fields['billing']['billing_company'] ); // remove the option to enter in a company
  unset( $fields['billing']['billing_address_1'] ); // remove the first line of the address
  unset( $fields['billing']['billing_address_2'] ); // remove the second line of the address
  unset( $fields['billing']['billing_city'] ); // remove the billing city
  unset( $fields['billing']['billing_postcode'] ); // remove the ZIP / postal code field
  unset( $fields['billing']['billing_country'] ); // remove the billing country
  unset( $fields['billing']['billing_state'] ); // remove the billing state
  unset( $fields['billing']['billing_phone'] ); // remove the option to enter in a billing phone number
  unset( $fields['shipping']['shipping_first_name'] );

  unset( $fields['shipping']['shipping_last_name'] );

  unset( $fields['shipping']['shipping_company'] );

  unset( $fields['shipping']['shipping_address_1'] );

  unset( $fields['shipping']['shipping_address_2'] );

  unset( $fields['shipping']['shipping_city'] );

  unset( $fields['shipping']['shipping_postcode'] );

  unset( $fields['shipping']['shipping_country'] );

  unset( $fields['shipping']['shipping_state'] );

  unset( $fields['account']['account_username'] ); // removing this or the two fields below would prevent users from creating an account, which you can do via normal WordPress + Woocommerce capabilities anyway
  unset( $fields['account']['account_password'] );

  unset( $fields['account']['account_password-2'] );

  unset( $fields['order']['order_comments'] ); // removes the order comments / notes field

  return $fields;
}

;

// add a custom Coming Soon page

add_action( 'template_redirect', 'my_custom_coming_soon' );

function my_custom_coming_soon() {

    if( !is_user_logged_in() && !is_page( 'coming-soon' ) ){

        wp_redirect( site_url( 'coming-soon' ) );

        exit();

    }

}


// To disable the coming soon page, just comment out this line by adding // at the start
//add_action( 'template_redirect', 'my_custom_coming_soon' );

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