Administration ▶ Users ▶ Accounts▶ Upload users
i should choose ?
Upload type: Update existing users only
Would selecting either of the options ("Existing users details" menu listed in the "Settings" box) unroll them from their existing courses and only enroll them into the courses specified in the csv file?
The existing courses enrollment would remain and new courses enrollment would be added to the student's profile??
Also, "Allow deletes" :Yes/No, what does it do to the user profile?