I need to add a new field/column to an existing Data Extension. The data extension is referenced all over the place. Am I going to mess up any of my existing journeys, automations, queries, imports by adding this new field/column?

What are the "gotchas" I need to know about?

1 Answer 1


There is nothing wrong with adding a new field to an existing data extension. You should avoid renaming or removing existing fields, as this will come with a risk of messing up queries, personalizations or similar in existing functionality.

If you can't see Create Attribute button on the data extension in Contact Builder, you should check the permission for that specific data extension:

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Clicking on Edit will show you whether it is allowed for users to create new attributes:

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Once you enable this option, it should be possible to add additional fields.

  • I'm missing something: "Contact Builder uses this data extension as part of a data relationship. Perform any necessary edits in Contact Builder." I go into Contact Builder, find my DE - but there is no "Create Attribute" button. help.salesforce.com/s/articleView?id=000356355&type=1 Sep 29, 2022 at 15:48
  • @SophiaMurphy please see my updated answer Sep 29, 2022 at 16:23
  • THANK YOU! I'm too new and can't upvote your answer. Feel like an idiot that I didn't see those. Sep 29, 2022 at 16:25

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