Creating automated number hierarchy in Wiki plugin

Hello,
I was able to put in place my wiki system, however, what my client needs if for the wiki to automatically increment numbers when a new wiki is created.

So to be more precise I need the week to do the following:

1. first wiki
2. second wiki added by client with automated number 2.
2.a second subwiki

... and so forth.

Right now I do have numbers in place, but I write down the numbers myself and and I create the childrens. Whatsmore, the wikis are not linked from one page to another - If I add a wiki on a subcategory if won't show up on the main table of content unless I also add it there.

I believe this is the way wikipedia works, so I'm hoping it is somehow possible to do this...

Many thanks in advance!
Claire