It is not easy to do. I will give you code for copying the rows in reverse, but updating formulas which referenced moved cells is a very advanced task and I can't provide code here that would cover all cases:

Workbook workbook = Workbook.Load("Source.xls");
Worksheet worksheet = workbook.Worksheets[0];
 
IWorksheetCellFormat blankFormat = workbook.CreateNewWorksheetCellFormat();
 
// Insert a blank row at row 3
const int InsertionIndex = 2;
 
// Gather up the rows to move down in reverse order
Stack<WorksheetRow> rowsToShiftDown = new Stack<WorksheetRow>();
foreach (WorksheetRow row in worksheet.Rows)
{
	if (row.Index < InsertionIndex)
		continue;
 
	rowsToShiftDown.Push(row);
}
 
// Moved the rows down
while (rowsToShiftDown.Count != 0)
{
	WorksheetRow sourceRow = rowsToShiftDown.Pop();
	WorksheetRow destinationRow = worksheet.Rows[sourceRow.Index + 1];
 
	// Copy the row formatting to the row below
	destinationRow.CellFormat.SetFormatting(sourceRow.CellFormat);
 
	foreach (WorksheetCell sourceCell in sourceRow.Cells)
	{
		WorksheetCell destinationCell = destinationRow.Cells[sourceCell.ColumnIndex];
 
		// Move the value to the cell below
		destinationCell.Value = sourceCell.Value;
		sourceCell.Value = null;
 
		// Move the cell format to the cell below
		destinationCell.CellFormat.SetFormatting(sourceCell.CellFormat);
		sourceCell.CellFormat.SetFormatting(blankFormat);
	}
 
	// Clear out the row formatting on the source row
	sourceRow.CellFormat.SetFormatting(blankFormat);
}
 
workbook.Save("Book1.xls");

Thanks for quick replay.

Sorry i dint get the logic for inserting rows could please give an example like grouping rows which you gave.

You can do something like this to group rows:

Workbook workbook = new Workbook();
Worksheet worksheet = workbook.Worksheets.Add("Sheet1");
		
// Group rows 5 thru 10
for (int i = 4; i < 10; i++)
    worksheet.Rows[i].OutlineLevel = 1;
 
// Make a sub-group of rows 7 and 8
worksheet.Rows[6].OutlineLevel = 2;
worksheet.Rows[7].OutlineLevel = 2;
 
workbook.Save("Book1.xls");

To insert a blank row, I think the only way to do it right now would be to look at the populated rows in reverse and move their data one row down until you hit the row that needed to be inserted. You would also need to fix up any formulas that were referencing cells or regions in the rows which were shifted down.

There is currently no way to use conditional formatting that I can think of.

Thanks for quick replay.

Can you please provide an examle for grouping.
And for others untill feature is available is there any alternative which can be done?

Thanks