eclipse STS 2.5.1 and tomcat 6.0.26 query

I have STS eclipse 2.5.1 and tomcat 6.0.26. I run an ant build from a clearcase view and copy the generated war onto webapps.

tomcat 6.0.26 is installed and configured to run inside eclipse servers tab. The project is imported as existing workspace into eclipse

I start the server and it deploys the war. My questions are

a) With plain eclipse 3.5 and tomcat with subversion I could publish add and remove projects easily

I cannot add or remove projects or publish here how do I do that ?

b) How do I configure debugging is it going to be straight forward as putting breakpoint and opening debug perspective by clicking the bug ?

What is "STS eclipse"?

a) Do you mean add and remove projects using Subversion or ClearCase?

b) That's how it is done in Eclipse...