Stock Triggers for WooCommerce plugin lets you control which actions automatically decrease or increase your product stock.
In addition, there are a number of admin options, like running decrease or increase actions manually via the “Bulk actions” dropdown in admin orders list, or setting stock actions to be performed on new order by admin.
Stock Triggers for WooCommerce Pro plugin version will add custom order statuses to the triggers list. And in addition, it will allow you to set custom triggers directly, by typing action names.