[Kim in Melb]

Howdy:
I'm numbering the appendices using a multi-level list. The first level uses
Alphas where the number of appendices goes beyond Z i.e.

A
B
C ....
X
Y
Z
AA
BB
CC ...
ZZ

Is there any way that I can change the format so that when the list reaches
Z, the numbering continues as follows:

A
B
C ...
X
Y
Z
AA
AB
AC ...

Thanks,
--
Kim