I can guide you on how to handle parts that were damaged during service, Nick.
To start, we'll have to create an Expense Account in the Chart of Accounts to specify the warranty replacements:
- Navigate to the Gear icon, then click Chart of Accounts.
- In the Account Name, enter the name you want (Example: Warrant).
- In the Account Type, choose Expenses.
- In the Profit and Loss tab, select Warranty.
- Disclaimer: Please seek advice from your Accountant for accurate and proper record-keeping.

Once done, let's create a Service Item and link the expense account we've made to it:
- Click the Gear icon, then choose Product and Services.
- Select New, then choose Service.
- Enter a name, such as Item Replacement.
- In the Income Account, select the expense account we've made (Warranty).
- Tick the "I purchase this product/service from a vendor."
- Click Save and Close.

Now that we’ve covered the basics, let's proceed to create an Expense to document the item replacement or warranty:
- Click the +New icon, then select Expense.
- When selecting the Payee, choose the vendor from whom you made the purchase.
- In the Item Details, add the Service we've made.
- Enter an Amount, then continue modifying the rest of the field.
- Click Save and Close.

Additionally, you might want to run a Profit and Loss Comparison report to compare your income and expenses for different periods.
Your success with this setup is my goal, Nick, so feel free to get in touch for further support along the way. Have a great day.