// Create a new workbook Workbook workbook = new Workbook(); IWorksheet worksheet = workbook.getWorksheets().get(0); worksheet.getRange("A:N").group(); worksheet.getRange("A:F").group(); worksheet.getRange("A:C").group(); worksheet.getRange("Q:Z").group(); worksheet.getRange("Q:T").group(); //level 3 and level 4 will be collapsed. level 2 and level 1 expand. worksheet.getOutline().showLevels(0, 2); // Save to an excel file workbook.save("ShowSpecificLevel.xlsx");