Query on LDAP Integration

[SanketKumaS]

The users and groups have already been imported into the ServiceNow instance by a LDAP server.Requirement is that we need to edit the Groups LDAP OU definitions to bring new groups into sys_user_group and add membership without creating new users in the sys_user table.If the user,that is to be added to the groups,is not present in the sys_user table then it should show an error message that 'user doesn't exist' but it shouldn't create that new user.We will import the groups from the server based on a particular filter.Could anyone suggest how we can achieve this and where do we need to edit in order to achieve this?

[JenniferRah]

Our sync doesn't create a new or duplicate user record, but I'm not sure if that's just because our users are all in ServiceNow or if there's a setting somewhere that prevents it. The only thing I can see would be the "Create new record on empty coalesce fields" is unchecked, but I think that's for the group record itself and not for the members. 

Have you tried this method and it added the unwanted user records?