Switching from private to public watch face

When testing a private app the banner says

"Note: Only you will be able to download and test the app.

If you want to publish your app after testing, you will need to upload it again and use another appID in the app’s manifest.xml.

You can manage and download your beta app in the "Beta Apps" section of the developer dashboard."

Question 1 - What is the best way to get another appID?

Question 2 - where is the "Beta Apps" section ? or is this just another name for privately testing an app?

Question 3 - with a new appID in the manifest.xml the upload was refused with:

"The following errors were detected in your app file

  • The app-id within the manifest-file deviates from the one originally registered for this app."

How does one submit for review, short of making a completely new submission?