Unscheduled Despatch Value

Would it be possible to add a total at the bottom of the Unscheduled Despatch Report, similar to the totals shown on the invoice and quoting pages?

However, rather than simply summing the Total Net column, what I really need is the total value remaining to be despatched.

Some orders show as Partially Despatched, so the Total Net value represents the full order value rather than the amount still outstanding. Ideally, the total would reflect only the value of items that have not yet been despatched.

This would give us a clearer view of the remaining despatch value still in the system.