Open the Excel document that contains the words that you want to change to all caps. Right-click on the header of the column to the right of the column of text that you want to convert to all caps.

Perhaps Excel will create a built-in function to convert text to sentence case in the future, but until then, a formula will work. If you would like to follow along in building this formula, you can ...

Press the "Caps Lock" key on the keyboard. Type the first instance of all capital letters to change into the Find What text field. Type the preferred capitalization into the Replace With text field.