i need add new columns in excel with knime
and i dont know do this
It would be helpful if you provide some specific on columns you need to add. KNIME is mostly analytical tool than form designer.
You could import the data into knime create the new column and export it again.
Or you could manipulate an excel file via Python. It would help if you could tell us more what you want to do.
Python Excel Drop Down
Python Excel manipulation