You need to
Add the plugin on vCO
If you are using a vCO appliance then you will have to create a kerberos config file on the appliance.
Configure kerberos authentication on the powershell host using WinRM service.
Add the host to vCO
The need is to remotely call powershell scripts from this host and run powershell commands on other hosts/targets by connecting to them through a session.
Here's a link for your reference
VMware vCenter Orchestrator Plug-In Documentation Center
Abhilash B
LinkedIn : https://www.linkedin.com/in/abhilashhb/