1) Goto Connector and Metadata Wizard from below path,
2) complete the wizard by providing Service URL and other details
3) Activity with all the service methods will be generated
4) Create an Activity in which you can take the output of above generated activity and call svcAddWorkObject activity. In that activity, createWorkPage is called to set up the data for the work object. There is WorkPartiesRule parameter you can specify when calling createWorkPage.