I am creating a spreadsheet with student phone numbers. Some
households have more than 1 student, so I want to Autofill the phone
numbers. However, Excel adds one to each number as I drag down. For
example, if John Smith's phone number is 555-0000, his brother Ted's
number becomes 555-0001, and sister Susie is 555-0002.

I tried turning the cells to text format, but it still has this
problem.

Any way of disabling this feature in specific columns? Holding CTRL
everytime is pretty annoying.