Hi,
The approach I'd adopt is to use a helper column say M, in the Listings sheet and check whether an item on the Active listings sheet exists in the List 1 or List 2 workbooks. If so grab the value from Column K in the List 1 or List 2 sheets, otherwise grab the value from column A in the Listings sheet
Then copy the helper column M and Paste it back to Column A as values.
e.g. in M2 of the Listings sheet copied down
Formula:
=IFERROR(INDEX('GS1 Barcode List 1.xlsx'!$A:$A,MATCH(K2,'GS1 Barcode List 1.xlsx'!$H:$H,FALSE),1),A2)
When you've pasted back to column A repeat the formula and change the GS1 List 1 reference to the List 2 reference.
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