How to bulk update a field

[Shivam_Ahluwali]

Hi

I have 3000 leads that are missing their respective and unique account numbers. I missed adding the account number column when I uploaded the CSV.

I want to update those email addresses and want them to have their respective account numbers reflected in their information tab.

The list already has campaigns running on them.

I have the updated CSV with email addresses in column 1 and the account number in column 2.

What will be the best way to accomplish this task without any error?

[SanfordWhiteman · Accepted solution]

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What will be the best way to accomplish this task without any error?

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A List Upload from the UI, in Trusted, Default mode.

(This is very basic Marketo functionality - have you read the docs?)

[SanfordWhiteman]

And you must move the thread to the Products space: https://nation.marketo.com/t5/Products/ct-p/products

The "University" space isn't a support space.