Numbers.app - How do I add a series of columns I have a spreadsheet with about 600 rows and 20 columns.

I want to add a unique identifier to each cell so that I can use the exported CSV output in another app.

So I thought that I could add a column after each existing column, and then use a formula to populate the cells.

So, first, are there better ways to do this? and if not, is there a short cut to adding 20 new columns?

Thanks
is there a shortcut to adding 20 new columns?


@ to this list of Numbers shortcuts


  Add or remove rows and columns with content ............... Option-drag the resize button


The shortcut to add 20 new columns is to option-drag the resize button to 20 new columns.