Want to install BI 7.0 on existing portal system with oracle Solaris 10

Hi gurus

I want to install (BI 7.0, solaris10, oracle) system on existing portal system with oracle and solaris 10 OS....

kindly let me know the how to add and create the project in already existing system for new BI system...is there any specific or need to care ful to install one more system on the same instance..

Thanks in advance