Content of the Export
When exporting to Round-trip only those issues/requirements will be exported which match the active view in that tracker.
The active view determines two important things:
• Which item will be exported the Excel such as the data rows in the Excel sheet.
• Which fields of the items are appearing in the excel such as the data columns appearing.
So you can easily control which issues are exported by defining a new tracker view or choosing an existing view that matches your needs. You can also create custom views to control the rows and columns being exported, see here:
Tracker Views