[Koha] Adding pre-defined Manual Invoice Types

I would like to add pre-defined Manual Invoices Types. For instance, Miscellaneous -$2, Cell Phone use - $5; where do I add theses values ? Kind Regards, Admire Mutsikiwa ICT Projects Manager Libraries University of Zimbabwe <Tel:+263-4-303276> Tel:+263-4-303276 "It is easy to dodge our responsibilities, but we cannot dodge the consequences of dodging our responsibilities." Josiah Charles Stamp, 1880-1941, former director of the Bank of England