Bring up the REST Binding wizard by right-clicking on your BPEL project, clicking "New" then "WSDL Document". The WSDL wizard is shown.
In the WSDL wizard, enter the "File Name" you want to use. Select "REST" for Binding Type and "REST - Inbound" if you are provisioning a RESTful service or "REST - Outbound" if you're implementing a REST service consumer. Clicking "Next" transitions you to the REST Binding wizard.
In the next screen, you can add the operations you want to implement.
You must provide the Operation properties by clicking on "Edit Operation" button for all operations added.
After adding all your operations, click on "Finish". You can edit the generated WSDL anytime after the initial creation. Note the binding section of the WSDL has a CDATA element where you may edit properties as needed.