"Roger Govier" wrote in message

Hi George

One way would be to use Search and Replace
On your sheet, type Ctrl + h
In the white pane marked Find enter C
In the pane marked Replace type Z
Click replace all.



It might be better using "Find - ABC" and "Replace - ABZ" as there might be
other cells with "C" in that the OP doesn't want to replace with "Z"!