Northern Trail Outfitters imports a daily feed of active customers into a data extension.

When importing a daily feed of active customers into a data extension, the "Overwrite" option should be used to ensure that the data extension only contains currently active customers. This import option replaces the entire data extension with the new data, removing any records that do not appear in the latest feed and ensuring that only the most current and relevant data is retained.

References:

Salesforce Marketing Cloud Documentation on Data Extension Import Types