I tried it. But I could not achieve the desired result. Following is the sample code:

Qt Code: 
  1. QVBoxLayout *MySubLayout = new QVBoxLayout(this);
  2.  QGroupBox   *MyGroupBox  = new QGroupBox(tr("Group:1"));
  3.  QGridLayout *MyGridLayout    = new QGridLayout(this);
  4.  
  5.  QCheckBox *Chek1 = new QCheckBox(tr("Check1")); //main checkbox1
  6.  QCheckBox *Chek2 = new QCheckBox(tr("Check2"));  // main checkbox2
  7.  
  8.  QCheckBox *Chek3 = new QCheckBox(tr("Check3")); //sub checkbox1
  9.  QCheckBox *Chek4 = new QCheckBox(tr("Check4")); //sub checkbox2
  10.  
  11. MyGroupBox->setLayout(MyGridLayout);
  12.  
  13. OutputLayout->addWidget(Chek1,1,0);
  14. OutputLayout->addWidget(Chek2,2,0);
  15. OutputLayout->addWidget(Chek3,3,0); // space required before this checkbox
  16. OutputLayout->addWidget(Chek4,4,0); //space required before this checkbox
  17.  
  18. MySubLayout->addWidget(MyGroupBox);
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Please indicate how can I add space as illustrated in the 1pic.jpg. Thanks