Hi Souvik, As Maciej Swiderski said, you can use Ant install script that comes with jBPM.5.3.0.Final installer. But in the manually way as you like. Open jbpm-install/build.xml with your favorite xml viewer and search for "install.demo", "install.demo.noeclipse".
It's bad of me to introduce myself article, but maybe this helps: https://community.jboss.org/wiki/JBPM-530FinalManualDeploymentGuideForBeginner
- Quang