Create the new columns using existing columns and previous columns created

Hi everyone,

I am the beginner and glad to join the KNIME community.

I need help in creating new columns using certain rules based on existing columns in knime.

For exemple :

I have the table with 2 columns Don1 and Don2.

I’d like to create the news columns Don_i (with i frome 3 to 20). These new columns base on the Don1 and Don2 and the previous columns created, for exemple in the photo:

It would be so nice if anyone could help me.

Thank you in advance.