regarding directory submission

i have a site which contains information on different topic

for example xxx.com/aaa contains info about aaa
and xxx.com/bbbcontains info about bbb

so can i submit my site under two category in the same directory??

 

Not many directries will allow you do this.

 

are info about aaa and bbb relate to each other ?
create subdomains instead of directoy strucure.

.
this also true. many don't allow deep linking. but can be done with little investment. paid directories (few free too) will give more than one link to your site and you can inlude /aaa and /bbb both in that

 

I agree with daredashi. Subdomains are accepted by many directories