What does that option do? Is it correct that, if the option "Replace existing users" is selected, then selecting the option "Add user to existing group" will add any groups in the input file to the user which the user is NOT already a member of? And corresponding, if the option "Replace existing users" is selected, then the option "Add user to existing group" is '''not''' selected, then any extra groups in the input file which the user is not already a member of will be ignored?
Thanks!