To simplify the process, OVERLAPS does not support traditional permission inheritance. Instead, you can opt when saving permissions to overwrite the permissions for all child OU’s with the ones being saved for the current container.
The options presented are:
Do not apply
The permissions will be applied to this container only.
Add permissions
Will add the permissions of this container to the ones below it. This merges permissions with existing users, adds users to containers that they were not previously given permission to, and will not remove any existing permissions.
Replace permissions
This option completely replaces the permissions of child containers with the ones of this container.