YES there is a way to do this.
- kinda tricky - but in short if you know the ip address you are using for the new website - you can make a change to your /etc/hosts (linux and MAC) or to your lmhost file (in Windows)
I will assume your using Windows first:
To use the LMHOSTS file, then you must configure LMHOSTS with the system name and IP address for iSeries NetServer to ensure client connectivity. To add an entry to the LMHOSTS file, follow these steps:
Go to the \WINNT\system32\drivers\etc directory.
Add the following entry to the LMHOSTS file:
TCP/IP-address domain name #comment
10.5.10.9 yourdomainname.com #comment that you want goes here...
In windows Vista / 7
Open the lmhosts.sam file in Notepad. The lmhosts.sam file is located in:
C:\Windows\System32\drivers\etc or if your system hard drive isn't C: the path is whatever your system path would be: %systemroot%\Windows\System32\drivers\etc
Once you open the file, simply modify the lines you need for the IP addresses you want to map to network names in the pattern IP address first network name second.
Save the file as lmhosts (without the .sam) and your change will instantly be active.
In MAC or Linux
sudo nano /etc/hosts
ip-address domain-name # comment
10.4.2.1 domain.com www.domain.com #comment that you want to say
then save and clear your browser caches - and try to visit the site @ the new install :-)