At first, we need to say these are two parts:
1 for partnerlink, when you add a invoke, in it's detail tab of the properties view, you can choose to create a global partnerlink, then a message dialog open to make you input name, after you input name, then another dialog open to make you choose partnerlink type. Then a parterlink created.
2 for partnerlink type, you need to create it by hands in the Source view of the wsdl editor.