Multiple domains in same host?

i have more than 4 domain, same niche , i can add all in one host? same ip ...etc?
Where is the problem
Thanks

 

Use Addon Domain in your Cpanel

 

i know how i can add the domain ...
If its a problem For SEO if i add same niches domain in one host ? Google noted my back links, give me PR ?

 

Yes, you can use them on the same IP as long as they don't link to one another. This can be considered a link scheme used to manipulate search results and result in penalization of your website.

http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=66356