Data Extensions Create a Data Extension Data Extensions are a great way to expand on your customer profiles by adding in additional data that links to one of the datamart fields. This can be used to link a preferred store ID to a list of stores and their locations or an assigned customer representative email address to a list of representatives and their contact information. Tutorial Please note: To try out the feature, click the full screen icon  in the tutorial.     Managing your Data Extensions The Data Extension tab in the Target screen provides multiple options for managing your Data Extensions including options to add/update more records or delete records. Tutorial Please note: To try out the feature, click the full screen icon  in the tutorial.