How to open only a number of columns per spreadsheet?

I have several daily spreadsheets that I use, some have only 7, 5, or 9 columns. How can I get each spreadsheet to only open the “used” columns?

In other words, I do not the all the extras columns to appear. Thanks for any suggestion or how to.

I think the best way is Menu/Data/Group and Outline, so you can easily hide/show those columns only with one click.

Thank you, it just what I need.