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To execute PowerShell commands and scripts using an already existing PowerShell instance in C#, you can use the following steps:

1. Import the Microsoft.PowerShell.Commands namespace and create a new PowerShell instance.

using System.Management.Automation;

PowerShell ps = PowerShell.Create();

1. Pass the PowerShell script or command to the PowerShell instance and execute it.

ps.AddScript("Get-Process");

var results = ps.Invoke();

1. Access the result of the PowerShell execution and manipulate it as necessary.

foreach (var result in results)
{
    Console.WriteLine(result.ToString());
}

1. Close the PowerShell instance when you're finished.

ps.Dispose();

You can also use the PowerShell RunspacePool class to manage multiple PowerShell instances and configuration options.