Use Sun Java Studio 2 with Existing Java Application

I have started using Sun Java Studio 2 and having fun and little difficulty creating a new Java web application from scatch. My question is where do I find information on Java Studio configuration to allow Java Studio to load up and modify Java server pages/forms in an existing Java application that I did not write?
The Java application has been created with Javabeans and using BEA Weblogic version 7, with a SQL-Server 2000 database backend.
Below is a bit of code out of one of the main Java forms.
<%@ page buffer="256kb" autoFlush="false" errorPage="../../common/system/error.jsp"
import="psdi.jsp.beans.*, psdi.jsp.common.*, psdi.jsp.app.wotrack.*, psdi.jsp.util.* , psdi.mbo.* , psdi.util.* "%>
I have looked around and have not found what I need to setup in Java Studio to allow me to load up a form and view it in the Visual designer, I keep getting errors on the psdi. references and cannot load up any pages.
I see on the server install ia folder under the main root <DIR> called <apps>, and inside the <apps> folder is a folder called <jsp> and in the <jsp> folder are sub folders for each main module within the application with all the related .jsp files. I have been manually editing the .jsp files using Windows Notpad and saving the changes. Then I rebuild the .ear file and my changes work fine. Since I have a lot of changes to make there has to be a better way than using Notpad.
My hope is somewhere is a point-by-point document on what to so I can use Sun Java Studio 2 to make my changes in a visual IDE.
Any assistance would really be appreciated.

Hi Giri,
Yep, this I know,b ut when I do I get errors messages and am looking for some form of point-bypoint instuction that better explains how to setup up custom libraries in Sun Java Studio, custom tags, etc.

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