I have two identical workbooks which must be maintained seperately and merged
occasionaly into a third identical MASTER.xls copy. There is no calculation
involved.

What I need to do is to look at each cell in a range and transfer its data
to the MASTER copy - ONLY if there is nothing in that cell already. If data
exists already in that cell of the the MASTER, I want to do nothing and
progress to the next cell.

I will need to do the same thing with at least one other copy.

The data amounts to a 1 used as a tick mark indicating a procedure performed.
MASTER.xls will ultimately have summaries and charts - that part is easy.

I am an OLD COBOL programmer, but a total newbie when it comes to VBA.
Any assistance would be greatly appreciated.
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Old time COBOL programmer, new VBA programmer.