You can create an Excel sheet using ActiveX, first you open an automation, selecting Excel application as the input. Then you pass this automation, use a property node and select worksheet on it. Pass the worksheet reference to an invoke node and select add, this way you add a worksheet to the current excel window (which you can show or not using property nodes). There are many examples of how to do this, and thik that there's a Excel toolkit donated by Philips research in the developer zone. For any more questions, you know where we are.
Good luck