So, if I Existing@mail.com in my List and I import a lcsv with :
Then have the Custom Field of Existing@mail.com updated.
(That would, for example, let me importa a bunch of records and segment them.)
Hi MrAnalogy, sorry about the late reply here. If you import a .csv list with subscribers and custom field values, any custom field values for existing/matching subscribers will be overwritten. Does this answer your question?