Copy existing values into cell below it

Hello everyone!

I'm trying to upload a spreadsheet where we have barcode numbers needing to be uploaded and attached to a product. I have two spreadsheets, one with the product number and barcode number and one with the product number and in-house SKU. I've sorted all the data where I have it from A-Z with the product number so the duplicates line up and I can attach the barcode number to the SKU. Unfortunately, I'm unsure how to automate this process. I can use a formula or VBA script to solve this as our POS (Point of Sale) program will read formulas.

It helped, thanks!!