QBank has a powerful feature that allows you to perform batch updating on multiple assets at the same time. Simply select the assets you wish to process and click the edit button.
Instead of going to the metadata editing view for a single asset, a Multiple Edit dialog will appear:
By default, overwrite mode will be selected, mening that any existing metadata will be overwritten by the new field content. You may also choose "Append" or "Clear field". Appending will add the string to already existing metadata and clearing will empty the metadata field entirely.