How to enter a recurring non inventory or service items to an invoice

How do I enter recurring non inventory items such as fuel costs without manually entering data in the Description column?

1. Create a DocLink: Service item. On the Linked tab, associate a Revenue and Expense account as needed.
2. Create an invoice as normal.
3. Select the Service item under Item Number.
4. Enter an Amount.
5. Select Process/Post when done.