--- schema_version: "1" id: bb18424b65afe1ff119fcfd8888710fef85968666b648a7334a815ba5bb18ba5 title: Create a Target Data Extension in Marketing Cloud Engagement collection: admin version: current locale: en-us portal_url: https://docs.salesforce.com/admin/current/en-us/mktg/264-0-0/mc_pers_segment_load_marketing_cloud_extension.md canonical_url: https://help.salesforce.com/s/articleView?id=mktg.mc_pers_segment_load_marketing_cloud_extension.htm&release=264.0.0&type=5 source_site: help.salesforce.com content_type: documentation content_hash: 491249a9f60269a2b014a465104cc0525b92af22f1d6e661e821a83637f3ac7f description: Set up a target data extension in Marketing Cloud Engagement to map the fields in the segment that you’re exporting. After you create the data extension, save the external key to set up data extracts in Automation Studio. products: - Marketing - Salesforce Personalization release: "264" --- # Create a Target Data Extension in Marketing Cloud Engagement Set up a target data extension in Marketing Cloud Engagement to map the fields in the segment that you’re exporting. After you create the data extension, save the external key to set up data extracts in Automation Studio. ### Required Editions

Permissions Needed
To create a target data extension:	A role with Administrator permissions

1. From the main navigation in Engagement, select **Audience Builder** | **Contact Builder**. 2. Click **Data Extensions**. 3. Click **Create**. 4. Complete the information in the Properties section. | Item | Description | | --- | --- | | **Creation Method** | Select **Create from New**. | | **Name** | Enter a name that matches the segment so that you can identify the data extension in Contact Builder. | | **Description** | Enter a description to identify the data extension. | | **Is Sendable** | Makes the data extension available as the source of a send. | | **Is Testable** | Makes the data extension available for testing. | 5. Click **Next**. 6. To set a data retention policy for your data extension, turn on Data Retention. 7. To apply the data retention policy, select **Apply To**. 8. Configure an option for the Retention Period. For a revolving time period, enter a value in the text field and select a time frame from the dropdown. For a fixed date, select the date. 9. Click **Next**. 10. Configure the mandatory attributes. Attribute names in the segment that you’re exporting must match field names in the data extension. When you begin entering column values in a row, an empty row is added to receive the next group of attributes. ![Note](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-mktg-mc_personalization-264-0-0-production-enus/16bf1f60-f44c-4260-a56e-f052cfe515a3/images/icon_note.png) Note If the Personalization system populates the sfmcContactKey attribute, map SubscriberKey to sfmcContactKey.

Primary Key	Name	Data Type	Required (is this “Nullable”?)	Length	Default Value
Selected	userId	Text	Not selected	50	N/A
Not selected	segmentMembership	Boolean	Selected	Blank	N/A
Not selected	emailAddress	Email Address	Selected	254	N/A
Not selected	sfmcContactKey	Text	Selected	50	N/A

11. Map any other attributes, like country or language using these values:

Primary Key	Name	Data Type	Required (is this “Nullable”?)	Length	Default Value
Not selected	<Field name that maps to the attribute>	Text	Not selected	50	N/A

12. Click **Create**. 13. Click **OK**. 14. Open the data extension and save the external key. You need the external key when you set up data extracts in Automation Studio.