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Thanks so much for the reply Ali!
The data is stored in a CSV file. The file also contains matching information (lead First Name, Last Name, Company and Email Address), which Marketo can use to match the new field data to the appropriate lead.
That's a good idea to create a Smart List. How will Marketo get the information from this CSV file if I create the Smart List and use "Change Data Value" to populate the field? Also, the data I need to populate the leads with is unique for each lead (i.e. I am not populating all 1800 leads with the same data, just unique data from the same field).
Thanks!
Andrea
Andrea,
What if the list of leads you are trying to add an extra piece of data to do not have an email address (they were previously uploaded to create PURLs)? I tried using the Marketo Unique Code in place of an email address but it created duplicate records instead of just updating the existing.
I am also trying to append an unique piece of data for each lead (6,000+) so batch updating one at a time with Smart Lists and Change Data Value won't work.