// Create a new workbook Workbook workbook = new Workbook(); IWorksheet worksheet = workbook.getWorksheets().get(0); //1:20 rows' outline level will be 2. worksheet.getRange("1:20").group(); //1:10 rows' outline level will be 3. worksheet.getRange("1:10").group(); //A:N columns' outline level will be 2. worksheet.getRange("A:N").group(); //A:E columns' outline level will be 3. worksheet.getRange("A:E").group(); // Save to an excel file workbook.save("CreateRangeGroup.xlsx");