How access portal application project classes from other portal app project

I created a portal application project in NWDS. I added few classes under src.core. I created another portal application project with JSPDynPage in NWDS. I want to use the first portal application project class into second portal application project. I am not yet created any par file. Could you please help me how to make reference and get the access to first classes.

-Sudheer.