Good question: Here's what I did:
I made the new Profile Field for this mod as 'Private', which means once it is entered, the field doesn't show up to be editted by the user or shown.
However, the problem lies in the existing users.
What you do is run a SQL Statement to update the value of that field for all users to, say, 'none'.
This script only works for new registrations ongoing.
If a user adjusted the value of that field, it won't add them to your secondary group unless it was while they were registering.
You should make the default value 'none' & instruct your visitors to only fill in their 'Invitation Code' if they were given one.
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