Data Import Wizard ignores empty cells in a CSV file.
Instead of clearing the value of the field, it treats the empty field as though you do not want to make any changes to that field.
To set a field value to null or erase the current value, fill out the column corresponding to the record and field to be updated with #N/A. The exceptions are a checkbox where you have to use 0 for unchecked values.
Import Wizard cannot null a lookup (Use an API tool like the Data Loader).
Example:
ContactID DoNotCall Title
005xxxxxxxxx0Ta 0 #N/A
005xxxxxxxxx1ZT 1 Salesforce Administrator
Visual: https://www.youtube.com/watch?v=ZqMVZucWdz4
Reference:
https://help.salesforce.com/s/articleView?id=000314136&type=1
https://developer.salesforce.com/docs/atlas.en-us.api_asynch.meta/api_asynch/datafiles_csv_valid_record_rows.htm
https://help.salesforce.com/s/articleView?id=000327368&type=1
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