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How to use VBA to combine similarly formatted single sheet Excel files.

Last Modified: 2020-03-22
I have a series of sets of Excel files. In each set, I have a group of Excel files all of the same format (same number of columns). All are single sheet outputs. I need to combine these into a single sheet excel file.  

I need to add in the name of each file in a new column after column 1, on each line. This way I know the source of the data.

I will have a directory in which are all of the source files (no other files)of one set. I want to place in this directory a NEW excel file containing the VBA that will combine these files into the NEW excel file.  

I have attached four source Excel files and a copy of the solution Excel file. I use excel 365 on Windows `10DonOHara.zip and Windows 7.

Thank you,
Don OHara
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