Open Server Manager, click Manage menu and select Add Roles and Features or click Add Roles and Features from quick menu in server manager home screen
On Before you Begin page, click Next
On select installation type page, select Role-Based or Feature Based Installation and click next
On Select Destination Server Page, Select server from the server pool and click Next
On the Server role page, Select Hyper-V
Click Add Features to add tool you want to create and manage Virtual Machines and click Next
On the Confirm installation selections page, select Restart the destination server automatically if required, and then click Install
Creating VM on Hyper V Manager
To Create a VM , Select New ->Virtual Machine from Action Tab on top right corner
Click Next on Before you Begin Page
Specify the name of the VM and click Next
Choose the generation of the VM and click next
Assign required RAM Memory for VM and Click Next
Select the Network Interface to connect VM to Internet and click Next
Create a Virtual Disk for VM with and select Storage destination and click Next
To Install a OS from ISO file , select Install an Operating System from bootable CD/DVD-ROM ->Select image file and click next
Click Finish on summary
To Assign vCPU for VM, Right Click on VM name and select settings
in processor section , increase the number of processor for VM and click Apply and Click ok
Now start the VM and Complete the OS installation and VM is Ready.