You can use the Indirect() function for this... but, unfortunately, it only works if your slave files are open...
Fortunately, there is a free addin that you can install that improves this function so that it can work with closed workbooks. The addin is called Morefunc.dll and can be gotten here: http://xcell05.free.fr/english/
After you've downloaded the adding..
try:
copied down.
Note: If you will work with open workbooks, then take out the .ext from the Indirect functions....no need to install the addin.
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