createLibraryVariableSetWithVariables.ps1

$MyLibrarySet = "MyVariableSet"

#Create an instance of a Library Set Object
$libraryVariableSet = Get-OctopusResourceModel -Resource LibraryVariableSet

#Add mandatory properties to the object
$libraryVariableSet.Name = $MyLibrarySet

#Create the Library Set
New-OctopusResource -Resource $libraryVariableSet

#Get variable set asociated with the library variable set created above
$variableSet = Get-OctopusVariableSet -LibrarySetName $MyLibrarySet -resourceOnly

#Creating a variable
$var = New-Object Octopus.Client.Model.VariableResource
$var.Name = "MyVar"
$var.Value = "A value"
#add scope here

#Adding var to variable set
$variableSet.Variables.Add($var)

#Saving variable set
Update-OctopusResource -Resource $variableSet