I'm self employed working for a music festival. We took a trip to visit a site, and my boss said to put the fuel invoice on my invoice.

The fuel cost

Open a "General Transaction"

Journal entry: Fuel out of pocket

From : Drawings

To; Motor Expenses (Or name of account in which you record Motor Fuel)

Amount

Your Profit & loss Account will now look like this (assume no other transactions)

Income Fees (say)