PowerShell sript to set IIS environment variable

Question

How can I automate the following steps by using PowerShell? :

1. Go to IIS and choose a website (website name will most likely be passed down in script as a parameter)
2. Go Inside the Configuration Editor
3. Choose the aspNetCore Section in the dropdown
4. Go inside the environmnetVariables
5. Add new Collection
6. Create new environment varialbe

Answer 1

Thanks to Lex Li, Seems like Configuration Editor generates scripts automatically before savings. This has lead me to getting the final PS script to be:

Add-WebConfigurationProperty -pspath 'MACHINE/WEBROOT/APPHOST/WEBSITENAME'  -filter "system.webServer/aspNetCore/environmentVariables" -name "." -value @{name='EnvironmentVariableName';value='EnvironmentVariableValue'}