Hi, arshia200.
To answer your question, yes, you will need to define the exchange loss as a new item and add it to your customer's invoice.
Here's how to create an item:
- From the Lists menu, select Item List.
- On the Item List window, select Item then New.
- Select the type of item you want to create.
- Fill in the item fields.
- Hit Save.
For more details about adding an item in QuickBooks Desktop, check out this article: Add, edit, and delete items. This will help you decide on what items you need to create as well as steps on how to create multiple stocks in QuickBooks Desktop. Also, it provides you links on how many items you can set up in QuickBooks.
Feel free to drop me a reply below if you have any other QuickBooks concerns. I'll be more than willing to lend you a hand.