[Koha] Overdue lists

We are a small volunteer library and so different people use the Koha system. I have already been using an overdue report, but until now we have only issued adult books through the computer. Starting in January children's books will be added. Is there a way to have an overdue report for adults only and a separate listing for children's issues? None of us are able to create or understand computer programming so we need very simple instructions. Thank you for any help Angela Davies Opawa Library Christchurch