Update Destination Records Mapping Option during Data Transfer

The ONLY STEP is to select the option to UPDATE Destination Records

Click in the Image on "Next - Back" or "Save" or "Cancel" to Navigate

(if the column you selected is part of a NON UNIQUE Key then a warning will show to indicate it)

TIP : You can use this option also when you are working on MULTIPLE columned Key's : DMC can support upto NINE columns in a KEY

(example : if the Destination's Table Key is combined on ColumnA and ColumnB and ColumnC - then defining ColumnA as "identifier" will be acceptable as the combination of the 3 values will be searched for)

The LAST STEP is to click on the "Save" button

(you can also select the relevant TABS to select or navigate within all Options)