Horizontal Scaling OBIEE 11g
On the new server copy the setup files for OBIEE and then run the Installer. Select Enterprise Install and then select Scale Out BI System option.
Here fill out the host name where the primary setup is installed and the port number for the web logic is listening.
The installer gives and option to place the Domain Home , Applications Home and Instance
After the confirmation the installer copies the relevant files to the directories.
Hope this help's
Satya Ranki Reddy