Wayne,
I think you are going to have limited help posting this J2EE/Ant deployment question to the support forum for MyEclipse ;). I don’t know off the top of my head how to do this, but will move this message to “Random Thoughts” to see if any of our users might know (or have done this).
Have you tried any mailing lists or forums related to OC4J? I think your question is quite dooable and sounds like a perfect crash-course in getting friendly with Ant.