I see no way to change sub-mail accounts to AOL. When I access my profile, there is nothing that allows editing the sub-account. My wife uses the primary account and I use a sub-account. I need to access email via the sub-account.
Primary accounts and sub-accounts are migrated separately. You should get a notification when the sub-account is ready to be moved.
What will happen to my verizon.net email sub-accounts?
All sub-accounts or email addresses associated with your Verizon account will receive a separate email notification, so please ensure that you sign in to each email address to start the migration process.