It is also possible to join two classes into one alternative form. This option is currently available only for the User and User - Settings system tables.
1. When creating an alternative form of the User system table, you have the option to check the Combine with user settings check-box.
2. Now if you switch to the Fields tab, you will see that besides the original fields contained in the Users table, fields from the User - Settings table are also available in the list of field, as you can see in the following screenshot: