Hi Surendra,
Yes, you need to choose "Expand ...." option and uncheck the Integrated Database, so it'll point to the existing CMS Database.
For details with images, check this out:
BI platform 4.0 cluster configuration - Business Intelligence (BusinessObjects) - SCN Wiki
To make @sapbiBO1 as default CMS, you DO NOT update the existing files BILaunchpa.properties and CMCApp.properties. Stop Tomcat. Navigate to C:\Program Files (x86)\SAP BusinessObjects\Tomcat6\webapps\BOE\WEB-INF\config\custom and create a file called ‘BIlaunchpad.properties’ with the following text:
cms.default=@sapbiB01
Save and Close and restart Tomcat. Create a similar file for CmcApp.properties as well.
Check this out as well, how to change CMS name | SCN
You'll have 2 CCMs (one on each server) after the installation of BO on 2nd server.
You don't have to change PlatformServices.properties, you'll have to create a new file under the Tomcat location (where you created BILaunchpad.properties and Cmcapp.properties)
Thanks,
Mahboob Mohammed