If you bill for reimbursable expenses, you can hide those expenses you never
intend to bill your customer for. Hiding an expense removes the cost from the
list of reimbursable expenses so that you don't inadvertently charge your
customer. The original transaction remains so that your reports will show the
cost as associated with the customer or job.
Follow these steps when you write an invoice to the customer.
To do this task
Click the Add Time/Costs button on the invoice to display
the Choose Billable Time and Costs window.
Click the Expenses tab.
For each expense you do not intend to bill, click in the Hide column next to
the Amount column.