I changed my app from universal to iPhone and I was not able to validate in the archive. I googled it and I realized that I had deleted my app and submit a completely new app if I want to change it to iPhone. there is no a button to remove my app like you do a "ready for sale" app. here is the thing nobody has downloaded my app yet so it is not like the app will stop working for some devices. I am kinda confused on what to do right help would be appreciated.
You will have to give your new iPhone-only app a new bundle id and create a whole new app for it in iTunes Connect.
If you don't want to sell the original universal app, remove it from sale in iTunes Connect. View the app in iTunes Connect. Select "Pricing and Availability". Then select "Remove from sale". Save.