Seperate address book for students within our school after O365 migration

Hi

We are a school for Example staff name is Justin Holden and the current email address format for staff is:  First Initials of the first name and first two letters of the surname i.e JHO@myorg.como.sch.uk
The students email format is, Year they start followed by the first initials of first name and surname.
i.e if the student name is Johanne Bayley  email will be 17jbayley@myorg.como.sch.uk

Now our school has joined a new trust called Russell Trust and they already use O365
Their email format is Nathan.West@russelltrust.org.uk
The trust wants to maintain a standard mail address format around the trust and now they have created sub domain for us i.e. myorg.russelltrust.org.uk
So once we migrate to O365 , our email address will change from JHO@myorg.como.sch.uk to
Justin.Holden@myorg.russelltrust.org.uk

Now for the students I suppose the mail address for will be same format as staff.
Will the students have a separate address book visible only for our school or will the students address also be visible around the trust address book.
Is it possible to make the students address visible only within our school.

Sorry it is long and want to make it clear. Any suggestions  and help will be great
lianne143Asked:
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Vasil Michev (MVP)Commented:
If it's the same Office 365 tenant (organization), everyone will be able to see everyone's details in the address book, regardless of domain names of email address format. You can however setup the so-called address book segregation feature, which will limit visibility. Read here: https://technet.microsoft.com/en-us/library/hh529948(v=exchg.150).aspx
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