Are you referring to allowable expenses (which would be deducted off your sales to get to net profit)? Typically these would include advertising, bank charges, insurance, tools & equipment etc. I raise an invoice on the relevant supplier and post to the appropriate nominal from the overheads area (7000 - 9999) in the chart of accounts. These costs appear on your p&l account.
You might also have use of private vehicle for business. This is handled differently and there is a section on this Business mileage expense