1. Open AAD Connect Synchronization Service Manager

2. Select on-prem AD connector and click Properties

3. Configure Directory Partitions -> Containers

4. Enter Password and click OK

5. Select an OU to be added, "AAD Connect" in this example

6. Create an user for test

7. A new user, "new_aad" created

8. "new_aad" not listed in O365 portal

9. Start AAD sync "Delta"

10. "new_aad" is synced/listed in O365 portal