Adding a SECOND Tracking Number after order is Fulfilled [?]

[Mark_S155]

Greetings!

I would like to know if there is a way to add a second tracking number in Shopify, after I have fulfilled an order? 

I am using Pirate Ship to purchase my shipping labels, and I am manually splitting single orders to ship two products separately. After purchasing both labels (for a single order), the order in Shopify shows up as Fulfilled. I would like to provide the customer tracking information for both products. Is this possible? Is there a workaround in Shopify, or would I have to email the customer the tracking information manually for each package that I bought labels for?

Thank you,

Mark