Thanks for using Aspose APIs.
Please use Worksheet.Cells.InsertRows() method for your needs. Please see the following sample code, its comments, input and output Excel files and screenshot for a reference.
The code inserts 10 empty rows starting from 3rd row.
Input and Output Excel files.zip (12.9 KB)
// Load a template file.
Workbook workbook = new Workbook("sampleInsertRows.xlsx");
// Get the first worksheet in the book.
Worksheet sheet = workbook.Worksheets;
// Insert 10 rows at row index 2 (insertion starts at 3rd row)
// Save the excel file.