Custom Column on Woocommerce Order Page

Hi,

I want to create a custom column for the “Important Note” on Woocommece Order page. The code now combine the Important note to Shipping Column. How can I create “Important Note” own column?
Here’s the code.

add_action('add_meta_boxes',function(){
    add_meta_box('greenbox_important_order_notes', 'Important Order Note (displayed only to admin)', 'greenbox_important_order_note_callback','shop_order','normal','high');
});

function greenbox_important_order_note_callback($post){
    	// Add a nonce field so we can check for it later.
	wp_nonce_field( 'greenbox_important_order_note_meta_box', 'greenbox_important_order_note_meta_box_nonce' );

	/*
	 * Use get_post_meta() to retrieve an existing value
	 * from the database and use the value for the form.
	 */
	$value = get_post_meta( $post->ID, '_greenbox_important_note', true );

	echo '<label for="greenbox_important_order_notes">';
	echo 'Note:';
	echo '</label> ';
	echo '<input type="text" id="greenbox_important_order_notes" name="greenbox_important_order_note" value="' . esc_attr( $value ) . '" style="width:80%; border: 1px solid green; " />';
}

function greenbox_save_meta_box_data_important_note( $post_id ) {

	/*
	 * We need to verify this came from our screen and with proper authorization,
	 * because the save_post action can be triggered at other times.
	 */

	// Check if our nonce is set.
	if ( ! isset( $_POST['greenbox_important_order_note_meta_box_nonce'] ) ) {
		return;
	}

	// Verify that the nonce is valid.
	if ( ! wp_verify_nonce( $_POST['greenbox_important_order_note_meta_box_nonce'], 'greenbox_important_order_note_meta_box' ) ) {
		return;
	}

	// If this is an autosave, our form has not been submitted, so we don't want to do anything.
	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
		return;
	}

	// Check the user's permissions.
	if ( isset( $_POST['post_type'] ) && 'shop_order' == $_POST['post_type'] ) {
            // its ok
        }
        else{
            return; // its not ok
        }



	/* OK, it's safe for us to save the data now. */
	
	// Make sure that it is set.
	if ( ! isset( $_POST['greenbox_important_order_note'] ) ) {
		return;
	}

	// Sanitize user input.
	$my_data = sanitize_text_field( $_POST['greenbox_important_order_note'] );

	// Update the meta field in the database.
	update_post_meta( $post_id, '_greenbox_important_note', $my_data );
}
add_action( 'save_post', 'greenbox_save_meta_box_data_important_note' );


function greenbox_order_extra_columns_content($column) {
    global $post;

    $order_id = $post->ID;
        
    //get_post_meta( $order_id, $key);

    /* show all meta 
    $meta = get_post_meta($order_id);
    $greenbox_comment_for_order="";
    foreach ($meta as $k=>$v){
     $greenbox_comment_for_order .= "<br>k = $k , v = $v ";   
    }*/
    $greenbox_note_for_order = trim(get_post_meta( $post->ID, '_greenbox_important_note', true ));
    
    switch ($column) {
        //case "order_notes":
        case 'important-notes':
            
            if(isset($greenbox_note_for_order) && !empty($greenbox_note_for_order))
                echo "<div style='background-color: red; color: white; padding: 2px;'> $greenbox_note_for_order </div>";  //$list_of_order_notes; 
            
            break;
    }
}

add_action("manage_shop_order_posts_custom_column", "greenbox_order_extra_columns_content");