How to read variables of Triggered Build from parent build?
This can be achieved with groovy script like below:
groovy:
import com.pmease.quickbuild.entitymanager.BuildManager;
// Assume the step triggering child build is previous step of the step executing this groovy script
def childBuildId = step.previousExecutedSibling.runtime.customData;
def childBuild = BuildManager.instance.load(childBuildId);
logger.info(childBuild.getVarValue("varName"));