I've an iweb shared website hosting service and i have multiples domain names title that let me reason for differents folders in /public_html.
For instance, i would like the site:
world wide web.one.com to points on /public_html/one
world wide web.two.com to points on /public_html/two
world wide web.three.com to points on /public_html/three
I not have the option on my small cpanel and i am trying with .htaccess are you able to assist me to???

I dont think what for you to do can be done. For those who have a devoted server this can be done, but this is not on a shared server. You will have to set this up by asking your host.