alpha-numeric Section Numbering

[Boris Seincher]

Hello!

I want to use LyX wor a law paper in german. When I use Part, Chapter, 
Section and so on I get a sctructure like this:
I., 1, 1.1 ... However I want something like this: A, I, 1, a), aa), 
(i), (ii).

Is it somehow possible?

Thank you in advance