Submit to different catergories?

Can I submit my site to more than one categories? My site belongs to 3 categories, can I submit it to all of them?

What is the MAX. number of categories that I can submit my site to?

Finally, if I got http://sub.domain.com, can I submit it to another categories?

Why do people ask this question over and over again? Apart from being discussed in this forum every few days, it is in the guidelines:

1) http://dmoz.org/guidelines/site-specific.html#deeplinks
" In the vast majority of categories and branches, deeplinking is the exception rather than the rule. "

2) http://dmoz.org/add.html
" Identify the single best category for your site. "

It does not matter if you setup subdomains, totally different domains or submit deeplinks. All the same to us.
...
Thinking about it, it does matter: If you setup lots of domains and try to fool editors this way, they might get angry. They might think you are trying to spam the ODP and take apropriate action.

... find the one best category ...



... deeeplinks are the exception not the rule ...

[Note multiple subdomains and multiple sites are also treated like deeplinks]

ODP lists useful web resources. If your three subdomains are on mountain climbing, Jupiter and yarn, you could possibly merit three listing. If your site is about kitty litter and the subdomains are about brown, red and yellow kitty litter it is quite unlikely you would be considered for three listings. How editors judge the content is what matters.