A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
You must use option buttons (a.k.a. radio buttons).
If you use Form Controls, you can divide them into groups by creating group boxes (also form Form Controls) and placing option buttons within a group box.
If you set the cell link for one option button in a group box, you automatically set it for the other option buttons in the same group box.
If you use ActiveX controls, you can divide them into groups by setting the GroupName property in the Properties window (right-click an option button while in Design Mode and select Properties from the context menu). Option buttons with the same GroupName are related - only one can be "on". Don't forget to turn off Design Mode when you want to use the buttons.