Sorting Invoice Detail by Employee/Date Billed

How can I do this?  Any guidance especially if its "you can't" would save a lot of time.
Apparently the invoice sorts by Date Billed (Date of Service) then by Service Item which we do not print on our invoices.  Unfortunately, the process creating the invoice cares about the item no matter what we try.

We want our invoice details to be
Employee 1     Date of Service 1    Hours 1     Rate    Amount
Employee 1     Date of Service 2    Hours 2     Rate    Amount

Employee 2     Date of Service 1    Hours 3     Rate    Amount
Employee 2     Date of Service 2    Hours 4     Rate    Amount

What we get is:
Employee 1     Date of Service 1    Hours 1     Rate    Amount