Adding values and sum

[Harry's GMail World]

List of numbers:
5
7
8
9
5
__
34--Sum

Now, I want to subsitute others numbers **but** to ADD to the present
sum.

2
5
7
__
48-Sum

 

[JE McGimpsey]

This could be modified to suit:

http://www.mcgimpsey.com/excel/accumulator.html