Open DHCP console, expand the server, right-click IPv4/IPv6 and click Defie User Classes
Specify the name and description. Now click with the mouse below ASCII and give a name, probably the same as before.
You have to use DHCP policies to configure DHCP options to the user class you created.
Right-click Policies and then click New Policy…
Give a Name and Description and click Next.
Choose User Class at Criteria, Equals at Operator and select the user class you created before from the Value drop-down list. Click Add and OK.
Click Next. Now you will the DHCP Options. Choose the option you want to configure and click Next. Then click Finish.
Now on a DHCP client, use ipconfig to assign the user class you created:
ipconfig /setclassid ethernet0 "Laptop" ipconfig /renew