Creating war file in eclipse

Hi, I have downloaded source code of one application from sourceforge.net. The application source code consists of 6 inbuilt java projects which are linked to each other. The source code consist of some ejb and servlet/jsp related code. I have to deploy entire application consisting of 6 projects on jboss application server. So how to combine all 6 projects as single application and how to create deployable war file of it ? I am using Eclipse JEE Helios.