How can we produce order acknowledgements in QuickBooks 2008, then convert them to invoices?

QuickBooks 2008. A client wants to produce order acknowledgements for clients so she raises an invoice  and marks it as pending. This appears to book the entries (sales, VAT, debtor) immediately. Is there anyway of doing this so that no bookings are made until she takes the "pending" status off the invoice? Ideally she would not go through the pending invoice route.