Add columns in Knime with specific indices

Hello I’m new to Knime and i’m trying to do some simple tasks and i’m having a hard time figuring out what’s possible with what tools…

So basically this is my detailed question : how do i do this in knime: for the first 9 columns in a table, add each column with the column of index (currentcolumn index * 9) and the column of index (currentcolumn index 9 2).

I have seen so many ideas for this, from groupby to math formula (multiple columns) to rule engine, i’m not sure if any of these can do what i want specifically because they don’t have a function to get the current_column index or to retrive columns by index, can someone help me out ?