I create a new application identifier every time I am ready to send a new (without updating) application to the store.
From the portal, go to the Application Identifiers tab.
Click the "New Application ID" button.
In the Description section: a common name should be something for you; I often use the name of the application, followed by “iPhone” or “iPad” or “Universal,” if applicable.
In the "Package Family Identifier (Application Identifier Prefix)" section: select "Create New."
In the "Package Identifier (Application Identifier Identifier)" section: as indicated, use something like com.domainname.appname. Remember this and add it to the Info.plist file in the "Package Identifier" section of the application or you won’t be able to download it.
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