Can I create an internal group in testflight. We have 2 different builds of our app that we want to test and the app isn't ready yet to be reviewed by Apple for external testing. For example: the login does nothing, you need a separate piece of hardware to test it, etc...
Normally you have an "iTunes Connect Users" group with the people register on you iTunes account like developers, admins and so on.
You also have an "External Testers" group with a possibility to add 2.000 emails to the people outside of the iTunes account.
You just need to create another group (you'll find a button with this text "NEW GROUP") and add the people to test that features and each time you upload a new build you add the group by clicking on the build that you want to test your app.
I hope this answer helps you.