If you want this to replace you current Currency Setting, then you can do
this my amending the 'Style'. Format>Style... and select it from the
drop-down and click modify nad set to double accounting under font tab.
If you don't wish to modify an existing one, then set up a new one using the
same route.
--
HTH
Nick Hodge
Microsoft MVP - Excel
Southampton, England
(e-mail address removed)