=CHAR(CODE(MID(A$1,1,1))+ROW(A1))&MID(A$1,2,1)+ROW (A1)&MID(A$1,3,1)+ROW(A1)&
MID(A$1,4,1)+ROW(A1)&MID(A$1,5,1)+ROW(A1)&MID(A$1, 6,1)+ROW(A1)

assuming your data starts in cell A1 with the entry "A12345."

--

Vasant


"Caroline" wrote in message
...
Cell 1: A12345
Cell 2: B23456

All cells are in the same column (column 1). The formula goes like
+1+1+1+1,
but I don't know how to make Excel change the alpha to the next letter.
Excel
also goes a little crazy when it comes to going from 9 to 10 - it goes
from 9
back to 0.

How do I create a formula which will cause the next cell to read:
"C34567",
which will also work for making the 9 go to 10, and not 0?

Also, I am looking to NOT use Visual Basic to solve this problem - only
Excel formulas, nested or not.