Not sure what version you are using.

In v 2017.2.1, if you edit the task, there is an export button to export the tasks.

On System Operation | Task Manager menu, there is an Import Tasks menu item.

You may have to edit the namespace name within the export if importing into a different namespace.

You can access an element or attribute without loading a schema by using the "path" to the element or attribute. 

For an element called "name":

Document.{/ClinicalDocument/recordTarget/patientRole/providerOrganization/name}

For an attribute  of "id" called  "extension":

Document.{/ClinicalDocument/recordTarget/patientRole/providerOrganization/id/@extension}

Did you try source.%Source ?