This is possible through a database script, but we don't offer support for creation of these. However, this would be a very easy one, because both fields are stored in the same table so you could create a script which updates
tblAssetCustom.BarCode on assets having the right serialnumber in
tblAssetCustom.Serialnumber. Alternatively use one of the custom fields for your asset tag. Before running database scripts, perform a
backup of your database.