Expense incurred at an event or other times can be entered into the system to provide more accurate financial information, as well as enabling automatic payment of any approved reimbursements (via your payroll system).
Generally, expenses are incurred at events and are entered at the time an event is completed (usually when time-sheets are also being confirmed).
Billable items
Some expenses might need to be passed onto your clients – in this case, simply edit the expense and mark it as 'Billable'. This will add a line to your invoices with the expense.