paintballlovr,
The formula requires that you have headers in row 1, so:
In workbook wm_load_sheet_template, sheet 'data', insert a new top row. You can leave it blank if you'd like, but I recommend having headers.
Then in that sheet cell A2, use this formula and copy down (adjust the file path location of the other workbook as needed):
When you start getting #N/A errors, you're out of unique values. If there are more than 1000 rows filled with data in the [wm_load_sheet] workbook, adjust the range to look farther than $A$1:$A$1000. If you don't want the header from that workbook, adjust the start row from $A$1:$A$1000 to $A$2:$A$1000.
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