Field Default Settings
Create a setting in the Portal Settings for mapping fields that will default to what is entered in another field.
For example, if a company uses the same info for the Customer Name and Customer ID, allow them to map these fields so that the Name always defaults to the ID. This could also be used in orders to default the Order Info to the same as the Description
Double Entry of Customer ID and Customer name is time consuming. Why are you expected to know the Customer ID?