I want to add a new module to prestashop back office order page. So can anyone tell me which tpl file to change so that I can simly add a new hook ? I added a hook to controller file, but I can't find a tpl file.
In case you want to add something to the order details page then there are several hooks available for the same, you can use any of them.
Some of the hooks are:
HOOK_TAB_SHIP HOOK_TAB_ORDER HOOK_CONTENT_SHIP HOOK_CONTENT_ORDER
To add something to the orders listing page through a module is not possible without overriding a core file. You need to override renderList() of file /controllers/admin/AdminOrdersController.php