You can select multiple fields from either the source or the target by using the <Ctrl> and <Shift> keys.
Tip: When multiple source fields are linked to one target field, a formula using the correct operator will be automatically created. For example, if the field type is character, the concatenation operator, "&", will be used.
Note: One or more source fields can be linked to one or more fields in the target. Descriptive Comments can be added to Data Links.
See also
Auto Linking source and target fields