Data transfer - Transformation - Field selection
Data transfer / Create new connection
Target type: XML or Text file, Click on "Next"
All of the source fields are listed here.
Every field in this list will be written to the target file.
Add / Remove fields
Move the currently selected field from one list to the other.
Add all / Remove all fields
Move every field from one list to the other.
Move fields up / down
Adjust the order of the fields.