Transfer data between files
 

I would like to trasfer a number from a cell in one file (worksheet) to
another and keep populatiing the next cell. I wanted to use a command button
to tranfer the numbers. For example

From: File ="POS 4-20-09", transfer cell = A1, Sheet = 1 (Lets say value =
100)
To: File = Data Master, Cell = A1, Sheet = "sum" (cell A1 now has 100)

Now the next day I hit the button
From: File ="POS 4-21-09", transfer cell = A1, Sheet = 1 (Lets say value =
500)
To: File = Data Master, Cell = A2(the next open cell), Sheet = "sum" (cell
A2 now has 500)

I will already have the days sheet open say "POS 4-21-09 so I just need to
have it send that A1 value to "Data Maseter" and put it in the next open
cell. I can even open that file as well if needed.

Can someone help me?
Thanks