How to map values from one CSV to another?

I have one CSV file containing article data which is structured as
follows (simplified):


Artnr;EAN;Artkern;
"111";"1234";"Some String"


Now I would like to map this data into a structure like below
(again simplified) and output it to a new CSV file:


sku,_something_a,description,something_b,...
"1234",,"Some String",,


I've created a template csv file holding only the header of the
target structure. Then I've added an input step reading this file.
Next I have added a second input step which reads the csv file
holding the actual data. I have tried joins, selects, etc. but here
I am lost (i am pretty new to kettle).


Which steps are necessary to merge this structures together into a new csv file?