how to point all my domains to mysite.com

[eyo]

hi guys i have like 4 to 5 extra domains i need to make use of. i also have a hosting acount with another site which i plan to use, is there a way to make those domains useful since mysite.com can probably have particular sections in the site for them? i think redirection or masking but im not sure if this is what i need. if someone has a lot of experience in this please advise me what to do or if there are common restrictions in web hosts that dont allow this. thanks.