I have this situation:
Adress cell value
A10 A
A20 B
A30 C
A40 D
A50 E
A60 F
A70 G

I want to merge value all cell from A0 to A79 and put in cell A80 as
SUM(A0:A79) in numeric.
I want that value in cell A80 is ABCDEF.
For example
If delete row A30 value in A79(before A80) is ABDEF
If add row A20 and put value in cell X, value in A81(before A80) is AXBCDEF
Do you have any idea

Bing