In the Reminders app, you can use multiple accounts—such as iCloud, enterprise-managed iCloud, Microsoft Exchange, and Yahoo—and keep all your to-do lists in one place. Your reminders stay up to date on all your devices that use the same accounts.
Note: All Reminders features described in this guide are available when you use updated reminders in iCloud. Some features aren’t available when using other accounts.
Go to Settings Set up mail, contacts, and calendar accounts on iPad