You can use the GUI: simply make a query selecting the work item you want and export them:
Click
File > Export
.
Alternatively, in the Team Artifacts view, you can right-click a query and select Export Work Items.
(you also have a button on the query result GUI itself:
!https://jazz.net/forum/upfiles/exporting_defcts_IE_issue.jpg
)
See:
- "Exporting work items"
- "Guide for Importing Jazz Work Items from Bugzilla and Other Systems" (about import, but illustrates export as well)