Use Word 2010's Numbering feature in tables and make it automatically number multiple table columns vertically. This way, each cell in each column will be placed under the correct number.

Number Word table rows and columnsI love discovering an easy trick, especially one I’ve never seen used before. Did you know that you can quickly add row and column numbers to a Word table ...

We explain 3 ways to make a Table of content in Word with different columns. A Table is an object that is made up of columns and rows.

Number the columns when the table is completely done to avoid resetting options. It seems a bit counter-intuitive to me and I can’t help but think there’s a better solution than this clunky one.