How do I setup REST service using a “Template" style param

I'm using SoapUI's REST service to do some testing. See this link for an example of the Template parameter: http://www.soapui.org/REST-Testing/unde ... eters.html

My request needs to look like this:

http://www.myservice.com/endpoint/parameter1/parameter2a,parameter2b/parameter3

How can I make the template style parameter occur >=1 times for the "parameter2" part of the URL?