---
schema_version: "1"
id: 09811f38d69272964126a4de2e11f19559dcd599e1943ffd60a7177ecca48b08
title: Customize a Field
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/mktg/264-0-0/dato_data_mapping_custom.md
canonical_url: https://help.salesforce.com/s/articleView?id=mktg.dato_data_mapping_custom.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 60fbb673fd2b377b3a9e845651cc1d1bfc585f7e60dbb8ae7ca509deb5563e36
description: You can customize an existing data model field.
products:
  - Marketing
  - Marketing Cloud Intelligence
release: "264"
---
# Customize a Field

You can customize an existing data model field.

### Required Editions

<table class="slds-table slds-table_bordered slds-max-medium-table_stacked slds-m-bottom_small permission">
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            <th scope="colgroup" class="slds-cell-wrap" colspan="2" style="text-align:center;vertical-align:top;" id="d79429e38">User Permissions Needed</th>
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            <td data-label="User Permissions Needed" class="slds-cell-wrap" style="vertical-align:top;" headers="d79429e38 ">To customize a field:</td>

            <td class="slds-cell-wrap" style="vertical-align:top;" headers="d79429e38 ">Admin</td>

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1. Navigate to the **Connect & Mix** tab.
2. Expand **Data Streams**, and then expand **Data Streams List**.
3. Create a data stream or edit an existing one.
4. At the bottom of the Data Stream page, click **Map to Model**.
5. Select a field.
    
    ![change field type](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-mktg-salesforce_datorama-264-0-0-production-enus/d38a342d-dd4a-4af8-8343-f372280a75dd/salesforce_datorama/images/data/data_mapping_change.png)
    
    To change the properties, click **Model Field Properties** (1). To add or edit a formula, click **Edit** (2). To use more advanced functions, click **Formula Editor** (3).
    
    If you customize a key field and it's already mapped, you may still see the old key in the platform. To delete the old key, use one of these methods:
    
    - If the data comes from a data-stream level data stream (Ads, Conversion Tag, and so on) you must recreate the data stream, or delete the key via the Dimension Explorer. For more information, see [Re-run and Recreate Data Streams](https://help.salesforce.com/s/articleView?id=mktg.dato_data_manage_changes_re.htm&release=264.0.0&type=5 "When you make changes to data streams, for the changes to take effect, sometimes you must rerun some of your data or recreate your data stream. Other times, such as when the changes only apply to data going forward, all it takes is saving the data stream.") or [Use the Dimension Explorer to Explore and Fix Data Issues](https://help.salesforce.com/s/articleView?id=mktg.dato_data_dimension_explorer_use.htm&release=264.0.0&type=5 "When you encounter issues with dimensions, for example an incorrect value, use the Dimension Explorer to find out what happened. Search for the dimension, discover where the issue stems from and then fix the issue instantly.").
    - If the data comes from a workspace-level data stream (CRM, ecommerce, and so on) the only way to delete the key is via the Dimension Explorer. For more information, see [Use the Dimension Explorer to Explore and Fix Data Issues](https://help.salesforce.com/s/articleView?id=mktg.dato_data_dimension_explorer_use.htm&release=264.0.0&type=5 "When you encounter issues with dimensions, for example an incorrect value, use the Dimension Explorer to find out what happened. Search for the dimension, discover where the issue stems from and then fix the issue instantly.").