Can I Bulk Update Data Copied through Lookup, Because I Changed Values in the Datasource App?
Once users copy data through a Lookup field, changes to values in the datasource app do not propagate to copied data in the Lookup field.
To update existing records, it is more efficient to update them in bulk by importing a CSV file.
If you bulk update values in the Lookup field by importing a CSV file, values copied by Field Mappings are also bulk updated.
However, following conditions have to be met.
If there are no overlapping values in the fields that are selected for "Key Field" in the existing record of the source app.
If "Prohibit duplicate values" is selected for the setting in the fields that are selected for "Key Field".
For detailed steps regarding bulk update of values of a Lookup field using a CSV field, refer to the Can I Import Values from a File to a Lookup Field? page.