>Michelle,
>
>You could think of the Trips as invoices. A customer would have multiple invoices in a month (trips) and you would summarize all the unpaid Invoices (trips) on the statement.

I was thinking of that, but a client could have 60 trips in a month and I'd rather not have them all seperate invoices. I think it would work better to have one invoice for the month and the trips as details of the invoice.

Thanks,

-Michelle