Using IF & VLOOKUP together

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I'm posting on here as a last resort, basically I've given up and hope someone can help!



I have 2 spreadsheets, one is a stock list (StockList.xls) and the other is a pick list (PickList.xls)

I need the Code_EAN (Column F) in StockList.xls to look at the Barcode (Column D) in PickList.xls

IF the Code_EAN is the same as the Barcode then the QTY PICKED (Column G) in PickList.xls is inserted into Amount Picked (Column H) in StockList.xls, this will then amend the Amount Remaining field.

If anyone can help with this it would be greatly appreciated