Can I test a SOAP web service that doesn't have WSDL?

Hi,

I have a working SOAP web service without any WSDL. I'd like to use SoapUI to test it, but I can't figure out how to create a SoapUI request without first importing the WSDL. Is it possible? If so could somebody help me get started?

I have a java client which successfully posts to the web service, so I have working xml. But I'd like to learn how to use SoapUI to do the same task.

Thanks all,
Steve