finish build trigger triggered by any build in a subproject

I have a project in teamcity with sub projects A and B. The build in subproject A depends on multiple builds in subproject B. I want to trigger a build in subproject A any time a successful build occurs in subproject B.

I can add a Finish Build Trigger, but it only lets me select a specific build. Is there a way to select the subproject (ie subproject B) instead of each individual build in the subproject? This would be helpful so that for every new build I put in subproject B I don't have to go and create a Finish Build Trigger for it.