To update test cases on excel testcomplete should have integration with excel.

We read and write to Excel routinely here.  Are you having a particular issue or just looking for an easier way?  I will add some code snips and links for you here in a few minutes.

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Here is a simple function to write data to a spreadsheet...

Ref:  https://support.smartbear.com/testcomplete/docs/testing-with/working-with-external-data-sources/excel/index.html

function Write2Excel(_valuesObj,_fileName,_sheetName)
{
  let excelFile = undefined;
  let excelSheet = undefined;

  if (!aqFile.Exists(_fileName))
  {  
    // Create a new Excel file and add a new empty sheet to it
    Log.Message(aqString.Format("The %s file does not exist and will be created.", _fileName));
    excelFile = Excel.Create(_fileName);
    excelSheet = excelFile.AddSheet(_sheetName);
    excelFile.Save();
  }  
  
  if (aqFile.Exists(_fileName))
  {
    // Open the existing Excel file
    excelFile = Excel.Open(_fileName);

    if(SheetWithTitleExists(excelFile,_sheetName) == false)
    {
      excelSheet = excelFile.AddSheet(_sheetName); 
    }
    else
    {
      excelSheet = excelFile.SheetByTitle(_sheetName);    
    }
    
    Object.entries(_valuesObj).forEach(([key, value]) => 
    {
      if(excelSheet.RowCount == 0)
      {
        // Write the header row
        Object.entries(value).forEach(([key, value]) =>
        {
          //Write Line Item Values to rows. 
          let cellData = "";
          Object.entries(value).forEach(([key, value]) =>
          {
            cellHeader = key;
            cellData = value;

          });
          excelSheet.Cell(key, 1).Value = cellHeader;        
          excelSheet.Cell(key, 2).Value = cellData;
        });
      }
      else
      {
        rowIndex = excelSheet.RowCount + 1;      
        Object.entries(value).forEach(([key, value]) =>
        {
          //Write Line Item Values to rows. 
          let cellData = "";
          Object.entries(value).forEach(([key, value]) =>
          {
            cellData = value;
          });
          excelSheet.Cell(key, rowIndex).Value = cellData;        
        });
      }
    });  
  }
  // Save the file to apply the changes
  excelFile.Save();
  //Excel.Close(fileName);
}

function SheetWithTitleExists(_fileName,_sheetName)
{
  if (! equal(_fileName, null))
  {
    if (_fileName.SheetCount > 0)
    {
      for (let i = 0; i < _fileName.SheetCount; i++)
      {
        if (equal(_fileName.SheetByIndex(i).Title, _sheetName))
        {
          return true;
        }
      }
      return false;
    }
    else
    {
      return false;
    }
  }
}

module.exports.Write2Excel = Write2Excel;
module.exports.SheetWithTitleExists = SheetWithTitleExists;