This was answered in your earlier thread How Do I Write an Excel Spreadsheet using Spreadsheet::XLSX.

Since you seem to struggle to understand what others keep telling you, let me see if I can try to explain this as simply as possible.

For .xls files, you can use Spreadsheet::ParseExcel to only read the Excel file and you can use Spreadsheet::WriteExcel to only write out an Excel file. Similarly for .xlsx files, you can use Spreadsheet::XLSX for reading only and use Excel::Writer::XLSX for only writing out an .xlsx file.

To modify an existing Excel spreadsheet, you have to use one module to read in the file and another module to write out the file. If you happen to be on Windows and have Excel installed, you can use Win32::OLE for both reading and writing. Otherwise, as far as I know, you have to use a combination of two modules to modify an existing Excel spreadsheet.