PaulWet:
What you ask is not possible.However, you may want to look into saving your excel sheet into a comma delimited file,
I'm sure it is a case of "must" rather than "may want to" or at least it's the most sensible way. This is easy enough to do on a Commodore 64 and it can't be harder on an Arduino. All you need is the shape of the array and the location of the cell in question.