If you have a configured option named "Bandwidth", then this will override the limit set on the product's "Other" tab. This custom limit will be used in the overages calculations.
For example: If the soft bandwidth limit is set to 1 TB and the configurable option set to 5 TB, the client will only be charged for overage once their usage passes above 5 TB.

Valid bandwidth units are "MB", "GB", "TB". A valid configurable option value would be "2 TB" or "2000 GB".