I am attempting to create a child portal in dnn and when I enter the information and partal alias it says that "The Child Portal Name You Specified Already Exists. Please Choose A Different Child Portal Name." I've tried other portal tittles and aliases but no luck, also this willbe the first child portal on this instalation of dnn.  here is my dnn version 04.08.02

thanks for the help

well I put it in as www.demo.mydomain.com is that the wrong format?  Im new to using aliases and dnn and child domains (pretty much a newbie here) so I might be typing it wrong.  everything else on my sight is working well right now, just need to be able to create the child portals.  Also was wondering if anyone has a way to develop child portals automatically using a set template, like a module for that or anything? 

it worked, thank you, guess I was just inputing it wrong, appreciate the quick response