I'm looking to split line items with a quantity > 1, into individual line items AFTER the order is received. I'm read a lot about this and see a bunch of great scripts that do this before the checkout process occurs such as https://businessbloomer.com/woocommerce-display-separate-cart-items-product-quantity-1/ and https://stackoverflow.com/questions/32485152/woocommerce-treat-cart-items-separate-if-quantity-is-more-than-1?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa.

Does anyone have any thoughts about how to do this AFTER the order has been completed? Or right on order creation in WooCommerce? I want anything with quantity > 1 to be broken out into individual line items.

So I believe I'll need to access all line items and then find those with quantity > 1 and then add new line items and decrement the quantity until it all balances out. Where I could use some help is how to create a line item? I know I can inspect them as shown below:

function inspect_line_items() 
  $order = wc_get_order( 390 );
    foreach ($order->get_items() as $item_id => $item_data) {

    // Get an instance of corresponding the WC_Product object
    $product = $item_data->get_product();
    $product_name = $product->get_name(); // Get the product name

    $item_quantity = $item_data->get_quantity(); // Get the item quantity

    $item_total = $item_data->get_total(); // Get the item line total

    // Displaying this data (to check)
    if ($item_quantity >1 ){
        echo 'HALP!';


Ok I'm continuing to try and I've been able to add line items (this isn't prod just testing it out, obviously this has some gaps :) ). That being said I can add a new item after checkout, and then with another hook change the order status back to processing. The issue is now the prices that are displayed. Even if I decrement the quantity for a particular item, it will still show the full/original cost. I tried updating the sub_total and total fields and then I get this funky Discount: line item. Any thoughts? Am I one the right track here?

add_action( 'woocommerce_checkout_create_order', 'change_total_on_checking', 20, 1 );
function change_total_on_checking( $order ) {
    // Get order total
    $total = $order->get_total();
    $items = $order->get_items();
    foreach ($order->get_items() as $item_id => $item_data) {

    // Get an instance of corresponding the WC_Product object
        $product = $item_data->get_product();
        $product_id = $item_data->get_id();
        $product_name = $product->get_name();
        $price = $product->get_price();

        $item_quantity = $item_data->get_quantity();
        $item_data['quantity'] = $item_data['quantity'] - 1 ; // Get the item quantity
        //$item_data['total'] = $item_data['total'] - $price;
        //$item_data['sub_total'] = $item_data['sub_total'] - $price;

        $item_total = $item_data->get_total(); // Get the item line total

        //do_action('woocommerce_add_to_order', $item_data['id'], $item_data['product_id'], $item_quantity, $item_data['variation_id']);
        WC()->cart->add_to_cart( $product_id, $item_quantity );
        $order->add_product( $product, 1);
        $order->calculate_totals(); // updating totals

        $order->save(); // Save the order data



add_action( 'woocommerce_thankyou', 'woocommerce_thankyou_change_order_status', 10, 1 );
function woocommerce_thankyou_change_order_status( $order_id ){
    if( ! $order_id ) return;

    $order = wc_get_order( $order_id );

    $order->update_status( 'processing' );

So I ended up combining a few answer out there and split out orders when adding to the cart, and also when updating the cart. The below works, though it's purely a front end customization. Hope this helps someone else!

function bbloomer_split_product_individual_cart_items( $cart_item_data, $product_id ){
  $unique_cart_item_key = uniqid();
  $cart_item_data['unique_key'] = $unique_cart_item_key;
  return $cart_item_data;

add_filter( 'woocommerce_add_cart_item_data', 'bbloomer_split_product_individual_cart_items', 10, 2 );  

add_action( 'woocommerce_after_cart_item_quantity_update', 'limit_cart_item_quantity', 20, 4 );
function limit_cart_item_quantity( $cart_item_key, $quantity, $old_quantity, $cart ){

    // Here the quantity limit
    $limit = 1;
    $orders_added = $quantity - $limit;

    if( $quantity > $limit ){
        //Set existing line item quantity to the limit of 1
        $cart->cart_contents[ $cart_item_key ]['quantity'] = $limit;
        //get product id of item that was updated
        $product_id = $cart->cart_contents[ $cart_item_key ][ 'product_id' ];

        for( $i = 0; $i< $orders_added; $i++ ){
            //iterate over the number of orders you must as with quantity one
            $unique_cart_item_key = uniqid();
            //create unique cart item ID, this is what breaks it out as a separate line item
            $cart_item_data = array();
            //initialize cart_item_data array where the unique_cart_item_key will be stored
            $cart_item_data['unique_key'] = $unique_cart_item_key;
            //set the cart_item_data at unique_key = to the newly created unique_key

            //add that shit! this does not take into account variable products

            $cart->add_to_cart( $product_id, 1, 0, 0, $cart_item_data );


        // Add a custom notice
        wc_add_notice( __('We Split out quantities of more than one into invididual line items for tracking purposes, please update quantities as needed'), 'notice' );

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