1 IP > Multiple Physical Web Servers

we are adding a couple new portals. We have one domain and 1 IP address.

The IP address and domain name resolve to our ASG.

I need to be able to do
www.name.tld = current web server
www1.name.tld = new web server
www2.name.tld = another new web server
All three reside behind our ASG

Can I do this wihtin the ASG?

Although I haven't used it yet, will I be able to use reverse proxy when the time comes?

Thanks for any and all help...