Be sure that you have already imported a WSDL into the Service References folder of an orchestration project. This WSDL is a reference to a service already running on a server.
Expand the WSDL to show the port type.
Right-mouse click on the port type and select
Add to PartnerLink Type
Complete the wizard that appears. Note that you cannot add a partner link type to the existing remote WSDL. The wizard allows you to create a new WSDL that imports the service reference.