create teststep from groovy created request?

Hi, 

I was creating requests from a groovyscript in SOAPUI Pro. 

example: 

....
WsdlRequest request = operation.addNewRequest("X")
def defaultRequest = operation.createRequest(true)
def xmlHolder = new XmlHolder(defaultRequest)
//modify the xml

request.setRequestContent (xmlHolder.getXml()); 

.....

Now to the question. is it possible to add this new request to a teststep? 

Thanks!