Custom Order Action in WooCommerce

There are two parts to solve with this objective.

The first part is to get a custom Order Action in the metabox of the individual Orders Page. I was trying to accomplish the same thing, but didn't find anything definitive on it, so I created a tutorial here:

http://neversettle.it/add-custom-order-action-woocommerce/

The second part is to add a custom order action in the Bulk Actions drop-down of the main Orders page. Skyverge has an excellent tutorial on that here:

http://www.skyverge.com/blog/add-custom-bulk-action/

The only specific thing you will need to take note of is to use the correct post_type. For WooCommerce orders you will need to use this in place of the first example on that tutorial:

add_action('admin_footer-edit.php', 'custom_bulk_admin_footer');function custom_bulk_admin_footer() {    global $post_type;    if($post_type == 'shop_order') {    ?>    <script type="text/javascript">        jQuery(document).ready(function() {            jQuery('<option>').val('export').text('<?php _e('Export')?>').appendTo("select[name='action']");            jQuery('<option>').val('export').text('<?php _e('Export')?>').appendTo("select[name='action2']");        });    </script>    <?php    }}

Notice the shop_order replaces the post for the condition checking which post_type to add the bulk actions to.

But fundamentally, @brasofilo is correct - for the most part WooCommerce uses standard WordPress structures, post_type mechanisms, and taxonomies. The process is the same for adding a bulk action to the Orders page as it is to the Posts page.

However, you are correct about the custom Order Actions on the individual Orders page - that is WooCommerce only and you'll need to reference the first tutorial on how to solve that part.