Excuse me I was unable to understand what group platform you are refering to. Can you provide additional information?
There is no such functionality available. In Sitefinity there is something similar available trough permissions and roles. A role can be created with a set of permissions to view certain pages, view some widgets and so on.
Then new users can be registered with this new role and access certain areas of the site or view features, widgets, pages that are not accessible or visible to other user roles.
Here is the related documentation: