We have received reports from our users that they would like to be able to select which fields are overriding. Currently, we give users the ability to "Overwrite", but it enables "Overwriting" for all fields. In some cases, users would like to only enable the "Overwrite" for specific fields (columns).
Would love to hear more details about the case(s) in which this occurs. Obviously, the current workaround is to split any import file into the fields that should overwrite and those that shouldn't and import them separately.