From a PM:
"Each number is 12 digits long. The extra number, always being a zero is in the fourth place of the 12 digit number. All of these numbers are in the same column and the number of cells varies depending on the imported data. "
1) You'd be better of sending this sort of thing direct to the board - then everyone gets to see the info & the problem is probably solved quicker
2) You could use the method suggested by SamS (have you tried it?)
3) You could use a formula that extracts the relevant portions of the string, something like:
=LEFT(A1,3)&MID(A1,5,LEN(A1)-4)
or
=(LEFT(A1,3)&MID(A1,5,LEN(A1)-4))+0
if you wish to retain the strings as numbers.
(assuming all strings are at least 4 characters long)
4) use an appropriate macro.
paddy