When your customer is using the Barcode module in Delogue you can access this information and see the Barcodes on the screen.
On any given style - just click on the Barcode sub-tab.
If your Customer has assigned Barcodes you will be able to see them in the column named "Barcodes".
In case the Customer has not yet assigned Barcodes or only assigned to some of them - then you will only see the ones assigned.
As a Supplier, you can NOT edit or assign Barcodes yourself.