def execSH(String sNode, String sMA, String eNm) {
    node("$sNode") { 
        sh "..."
    }
}
pipeline {
    agent {
        node {
            label '...'
        }
    }
    stages {
        stage('StatusCheck-Group') {
            parallel {
                stage('Group-1') {
                    steps {
                        execSH(...)
                        execSH(...)
                        execSH(...)
                    }
                }
            }
        }
    }
}