How to add configurations to Xcode?

Solution 1:

Have a look at the project settings. There is a + button that you can use to add to configurations here.

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You don't need it.

Make sure you check the following list before you Archive:

In Edit Scheme: Select Release as Build Configuration for Archive,
In Project Build Setting: Set Entitlements.plist and your Distribution code signing for Release scheme,
In Entitlements.plist: Set No to ‘can be debugged’.

Then archive and share with your ad-hoc provisioning or submit with distribution provisioning.

Hope this is a comprehensive checklist.

EDIT:

to duplicate an existing configuration: enter image description here