Jazz upload/build of existing project with subprojects

If there exists a parent project with subcomponents, how should this be represented in the Jazz source control? Does an existing project with a build.xml file that reference subdirectories need to be modified to look at sibling components (so that an Ant build definition can reference the top level build file)??

Not having Jazz subcomponent support forces us to change our Ant script. Does everything have to be stuffed into one component??

Parent (component??)
- build.xml
- Subproject1
-- build.xml
- Subproject2
-- build.xml