How to run multiple suites from multiple projects from ant

I understand that this is quite old. Are you able to achieve what you intended?

You can write a macrodef(like a function) which does the execution(the same stuff what you defined in the target), it will have parameters of soap project name.

Have multiple targets defined which makes a call to macrodef by passing the name of suite if application, and soap project file name.

On top define a target say all and mentioned all targets to be called in the sequence you needed.

Hope this helps.