My name is Ava, I’m one of Shopify’s Gurus and I’m here to help :)
You can indeed add more than one tracking code to an order. If you go to your order, then select "Start Fulfilling".
After that, you can change the quantity of the item you want to add a tracking number to 1, then the other two items to 0.
You can then click Fulfil Items once the tracking information has been added. The order will then update with only two items left to fulfill.
After that, you can go back in and do the same thing, set the quantity of the item you want to add tracking information to down to one, then the remaining item to zero.
I have made a short video for you sing my test store, just to walk you through the process!
Let me know if you have any more questions, happy to help!
Social Care Guru | firstname.lastname@example.org
If all the three products are packed into different packages with labels, you can easily do that using Shipment tracking & notify app too. The app helps you automate the tracking process by sending live tracking notifications to your customers. The app also provides you with an integrated "Track your order" page from where your customers can track their orders easily.