Complete Invoices

I'm a consultant that bills by the hour, sells services and products to my clients and gets reimbursed for expenses. If I understand the system correctly, there isn't a way for me to put all of these items on a single invoice. If I use the existing systems I'd have to generate an invoice using the timesheet for my billable hours; another invoice for reimbursable expenses using the expense options; and then the invoice tab to generate another invoice for sales.

Is this really correct??