need some help in interface

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Hi all,

I have finished installation and configuration for Sympa v-3.4.4.3 and now it 
is working very well :) , but i have question.
Now when i add a a list , the wizard asks me in which category shall i put 
this list in, (say for example i put it under the category of News and Media) 
now i need to make the sub-categories are visible to users (i.e. The main 
Category and under it the sub-category)
like this

* News and Media
- List-1
- List-2

* Education
- List-1
- List-2
and so on ...

So can anyone help me to do this ?????

Thanks in advance
Kareeem