We are thinking of changing to Woo commerce from Virtuemart but there doesn't appear to be any way of adding barcodes. We have found one plugin and although it works, ATUM and Woo commerce doesn't allow search by barcode. Also, we can currently add or minus stock by scanning barcodes, this is very useful but once again this doesn't appear to be possible with ATUM or Woo, although we see that you may have a BARCODE addon coming 2021 ??