Begin by creating a customer profile for your FBO under Company Data > Customer List
In your FBO's customer profile, scroll down and deploy the Equipment menu
Then, begin to type in the equipment you want to invoice under 'Link Equipment', click the option that shows up in the dropdown and add it to your equipment list.
Now that the equipment is linked to the customer, it's time to create an invoice!
Accounting > Invoice > New Invoice
Begin typing your equipment name under 'Sold To' and select the option in the dropdown.
Add your fuel type under 'Item Description' and link your fuel ticket.
Since this will be a $0 invoice you will need to process it using the payment method COMP.