Selected the range of cells you need to replace.
- Go to Home > Find & Select > Replace or Ctrl + H
- Find what: ,
- Replace with: CTRL + SHIFT + J
- Click Replace All
Somehow CTRL + SHIFT + J is registered as a linebreak.
Reference: http://stackoverflow.com/questions/14856501/substitute-a-comma-with-a-break-link-in-a-cell
Last Updated on October 26, 2015