When you upgrade an account to ManageFlitter Pro, you can upgrade multiple accounts at a discounted rate.
These multiple account upgrades are intended to be used for unique Twitter accounts and can not be repeatedly swapped out during the month. ManageFlitter allows up to 1.5x your account limit in changes per month. So if you have a package with 5 upgraded accounts, you can add a sub account to your parent account up to 8 times.
If you hit up against this limit you will receive a message saying 'We have detected a high churn rate of subaccounts on your Pro account. You have been limited from adding additional Pro accounts in this billing cycle.'
You can either add wait until the end of your current billing cycle to add new accounts or upgrade your account to a higher level to add more accounts in each 30 day period.
If you've hit this limit accidentally please contact support and we may give you a one-time reset on your churn limit.