Add columns to admin orders list in WooCommerce

Updated: 2018-03-30 - added positioning feature to the new columns

So you if you want to add some columns in the orders Admin list page (in backend):

ADDING COLUMNS IN WOOCOMMERCE ADMIN ORDERS LIST

In the example below, we add 2 new custom columns, before existing "Total" and "Actions" columns.

// ADDING 2 NEW COLUMNS WITH THEIR TITLES (keeping "Total" and "Actions" columns at the end)
add_filter( 'manage_edit-shop_order_columns', 'custom_shop_order_column', 20 );
function custom_shop_order_column($columns)
{
    $reordered_columns = array();

    // Inserting columns to a specific location
    foreach( $columns as $key => $column){
        $reordered_columns[$key] = $column;
        if( $key ==  'order_status' ){
            // Inserting after "Status" column
            $reordered_columns['my-column1'] = __( 'Title1','theme_domain');
            $reordered_columns['my-column2'] = __( 'Title2','theme_domain');
        }
    }
    return $reordered_columns;
}

// Adding custom fields meta data for each new column (example)
add_action( 'manage_shop_order_posts_custom_column' , 'custom_orders_list_column_content', 20, 2 );
function custom_orders_list_column_content( $column, $post_id )
{
    switch ( $column )
    {
        case 'my-column1' :
            // Get custom post meta data
            $my_var_one = get_post_meta( $post_id, '_the_meta_key1', true );
            if(!empty($my_var_one))
                echo $my_var_one;

            // Testing (to be removed) - Empty value case
            else
                echo '<small>(<em>no value</em>)</small>';

            break;

        case 'my-column2' :
            // Get custom post meta data
            $my_var_two = get_post_meta( $post_id, '_the_meta_key2', true );
            if(!empty($my_var_two))
                echo $my_var_two;

            // Testing (to be removed) - Empty value case
            else
                echo '<small>(<em>no value</em>)</small>';

            break;
    }
}

Code goes in function.php file of your active child theme (or active theme). Tested and works.

Related answer (for products): Add custom columns to admin producs list in WooCommerce backend

The main mistake is on last function where $display_value should be replaced with just $value and then return $value; should be located at the end before last closing bracket.

I have also revisited all your code:

add_action( 'woocommerce_checkout_create_order_line_item', 'custom_checkout_create_order_line_item', 20, 4 );
function custom_checkout_create_order_line_item( $item, $cart_item_key, $values, $order ) {
    $supplier_url = $values['data']->get_meta( 'supplier_url' ); // Get product custom field value
    
    // add product custom field as custom order item meta data
    if ( ! empty($supplier_url) ){
        $item->update_meta_data( '_supplier', $supplier_url );
    }
}

add_filter('woocommerce_order_item_display_meta_key', 'filter_wc_order_item_display_meta_key', 20, 3 );
function filter_wc_order_item_display_meta_key( $display_key, $meta, $item ) {

    // Change displayed label for specific order item meta key
    if( is_admin() && $item->get_type() === 'line_item' && $meta->key === '_supplier' ) {
        $display_key = __("Supplier", "woocommerce" );
    }
    return $display_key;
}

add_filter( 'woocommerce_order_item_display_meta_value', 'change_order_item_meta_value', 20, 3 );
function change_order_item_meta_value( $value, $meta, $item ) {

    // Change displayed value for specific order item meta key
    if( is_admin() && $item->get_type() === 'line_item' && $meta->key === '_supplier' ) {
        $value = __('<a class="button" target="_blank" href="'.$value.'">Order</a>', 'woocommerce' );
    }
    return $value;
}

Code goes in functions.php file of the active child theme (or active theme). Tested and works.

Here is the way to do it with that 2 custom functions hooked. The first one create the column with the title, the second one populate the column with the products data. But you will need to set in that second function, the correct corresponding meta_key to get the data.

Here is that code:

// ADDING A CUSTOM COLUMN TITLE TO ADMIN PRODUCTS LIST
add_filter( 'manage_edit-product_columns', 'custom_product_column',11);
function custom_product_column($columns)
{
   //add columns
   $columns['delivery'] = __( 'Delivery time','woocommerce'); // title
   return $columns;
}

// ADDING THE DATA FOR EACH PRODUCTS BY COLUMN (EXAMPLE)
add_action( 'manage_product_posts_custom_column' , 'custom_product_list_column_content', 10, 2 );
function custom_product_list_column_content( $column, $product_id )
{
    global $post;

    // HERE get the data from your custom field (set the correct meta key below)
    $delivery_time = get_post_meta( $product_id, '_delivery_time', true );

    switch ( $column )
    {
        case 'delivery' :
            echo $delivery_time; // display the data
            break;
    }
}

Code goes in function.php file of your active child theme (or theme) or also in any plugin file.

Tested and works.

How to get the correct meta_key slug:

To find the correct meta_key slug corresponding to the "delivery time", you should need to make search in your database using PhpMyAdmin. You will have to search for delivery term in wp_postmeta table this way:

Then you will get this kind of results (here there is just 1 line with a fake slug):

So now you should be able to get the correct slug name (like this fake "_delivery_date" one) …

Related answer (for orders): Add custom columns to admin orders list in WooCommerce backend