Contact Groups in Lync Server 2013

HI,

I have deployed the Lync 2013 server . I can successfully login to Lync client 2013 using lync server 2013. But i wan to create a group list/group  on server side and all clients/user i will add in this list/group. After login to Lync client this group will show on all the user on client side. In office Communicator 2007 R2 i had created the same requirement. But in lync 2013 server i did not find this kind of option.

Help me on this

Thanks