Give a user permission to manage specific VMs only

Hello,

I'm using Hyper-V 2012 R2 server.

I would like to provide a user (non administrator) the possibility to manage a pack of VMs only.

So let say we have 25 VMs, I need to give him a way see and manage only part of them via Hyper-V Manager.

I saw an old article describing how to do that, but it's outdated, using Authorization Manger, which is not present anymore.

Any suggestions will be appreciated.

Best,

Simeon