We are achieved Auto site creation from nintex as per Customer requirement BUT
Permissions for newly created Site has Inheriting from Parent Permissions ,We don't need Parent Permissions
Required Permissions are only
[Project Name] Members - Contribute
[Project Name] Owners - Full Control
[Project Name] Visitors - Read
How to avoid creating others below Groups from Nintex ?
Your support is very valuable to our Trust on Nintex product
SP groups will come automatically from the parent site when you break inheritance, which is a default sharePoint behaviour. You could probably use SharePoint webservice to remove the groups that get added by default. SP web service can be called from within Nintex.
There is an article which shows you how to add a group and you could use the same principle to call the remove group webmethod.
Link to article -