Hi,
For the email, you have now the working tools to put the code directly in the email you want to send.
If you want to display such information in the front-end website, in the customer orders through his HikaShop customer dashboard ; like Mohamed or Xavier told you in the previous messages, the best is to use HikaShop business in order to have "order custom fields" feature.
Thanks to them, you will be able to create an order custom field for the tracking number ; to edit it in the HikaShop backend and display it in the front-end (and also directly in the emails).
The "order custom fields" has been made for such specific purpose: to extend the features of orders with something flexible.
If you don't want to use the "order custom fields", I'm afraid that you will need to create the column in the database and then, develop the system to edit the tracking number in the backend and display it in the front-end. It'll require php/development skills.
Because it's a big development, it's not something provided by our support ; we can help with small developments but not for such kind of big development ; more than that, the development is not required because the "order custom fields" already provide it.
Regards,