Thanks for following up with the Community, JayBlake.
 

If you're seeing charges show up as "Not Specified" on reports and looking for a way to classify them, you'll need to create a product/service item for shipping charges.
 

Before getting started, there's a couple things to keep in mind. In the event you're going to use a shipping charge as a Product/Service line item, leave your Shipping field blank. If you do leave the Shipping field empty, it won't appear on invoices which have been emailed or printed.
 

Here's how to assign a class to a shipping charge:
 

1. Confirm your Class Tracking preference is turned on before performing the following steps. When you check your class tracking settings, if you assign one class per transaction, there's no need to also assign a class to the Shipping service item. Your class for the transaction will also apply to that Shipping item.
2. Go to Sales, then All sales.
3. Click New transaction.
4. Choose a transaction you'd like to enter.
   
   
    
5. Pick a customer from your drop-down list, then specify a Shipping Charge from the Product/Service column.
6. Assign a Class to your charge by selecting the drop-down list of your Class column.
7. Select Save and close.

I've also included a detailed resource about assigning classes which may come in handy moving forward: Assign a class to a shipping charge
 

I'll be here to help if there's any questions. Have a lovely Friday!