#Example 1
$Arguments = @{Name = "New Boundary Group"}
Set-WmiInstance -Namespace "Root\SMS\Site_PR1" -Class SMS_BoundaryGroup -Arguments $Arguments

#Example 2
$Arguments = @{Name = "New Boundary Group"}
Set-WmiInstance -Namespace "Root\SMS\Site_PR1" -Class SMS_BoundaryGroup -Arguments $Arguments -ComputerName Server

#Example 3
$Arguments = @{Name = "New Boundary Group"}
Try{
    Set-WmiInstance -Namespace "Root\SMS\Site_PR1" -Class SMS_BoundaryGroup -Arguments $Arguments -ComputerName Server -ErrorAction STOP
}
Catch{
    $_.Exception.Message
}

#Example 4
$WMIConnection = [WMICLASS]"\\Server\ROOT\SMS\Site_PR1:SMS_BoundaryGroup"
$NewBoundaryGroup = $WMIConnection.psbase.CreateInstance()
$NewBoundaryGroup.Name = "New Boundary Group"
$NewBoundaryGroup.Put()

#Example 5
Function New-BoundaryGroup
{
    [CmdLetBinding()]
    PARAM(
    [Parameter(Mandatory = $True, HelpMessage = "Please enter site server name")]
         $SiteServer,
    [Parameter(Mandatory = $True, HelpMessage = "Please enter site server code")]
         $SiteCode,
    [Parameter(Mandatory = $True, HelpMessage = "Please enter Boundary Group name")]
         $Name
         )
 
    $Arguments = @{Name = $Name}
    Try{
        Set-WmiInstance -Namespace "Root\SMS\Site_$SiteCode" -Class SMS_BoundaryGroup -Arguments $Arguments `
        -ComputerName $SiteServer -ErrorAction STOP
    }
    Catch{
        $_.Exception.Message
    }   
 
}
New-BoundaryGroup -SiteCode PR1 -SiteServer Server -Name "New Boundary Group"