Writing data to an existing workbook using soapuipro(groovy)

Hi,

I am trying to write data to an excel file from soapui pro......

I have written a code to read a test case name and execute the test case now i want to write the status of the execution to the same excel file....
But i am not able to write the data ......If someone has a code to write data to the existing workbook it would of great help.

Regards,
Dipti