In addition to the standard tasks included in the Ant, you can use custom Ant tasks to extend the functionality of your build scripts. You can use existing custom tasks or develop your own using the Ant module's Custom Ant Task template. Once you have defined a custom task and used it in a project, the Ant module recognizes the task's XML structure and enables you to edit them in the Explorer just like standard tasks.
For more information on using custom Ant tasks in the IDE, see:
Creating a Custom Ant Task
Ant Classpath and Custom Ant Tasks