Modify a list via csv

Howdy! I want to modify a set of users by importing a csv. All looks fine except I want to add an item to a list but it instead replaces the entire list with just the one item on the csv. Is there a way around this?

I know I could export the current data & lists just beforehand and then add my item in the csv and upload, but if the user has made any changes in the interim they will disappear.

Thanks a mill!

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