Tgood37 asked the Answer Line forum how to add checkboxes to Excel spreadsheets, and make sure that checking a box will have an effect.

Before you can add checkboxes to an Excel worksheet, you will need to expose the Developer tab (if it is not already visible). To do so, click on the File menu and then select Options, followed by ...

You don't have to add a header to every Excel worksheet individually when you can group them first.