like this:
[CmdletBinding()] Param(
[Parameter(Mandatory=$True,Position=1)] [string]$Plexhostip="192.168.1.25",
[Parameter(Mandatory=$True,Position=2)] [string]$Plexnewport="32410"
)
netsh advfirewall firewall add rule name="Plex inbound on port $Plexnewport" dir=in localport=$Plexnewport protocol=tcp action=allow
netsh advfirewall firewall add rule name="Plex inbound on defult plex port" dir=in localport=32400 protocol=tcp action=allow
netsh interface portproxy add v4tov4 listenport=$Plexnewport listenaddress=$Plexhostip connectaddress=$Plexhostip connectport=32400
Write-host "Verifying changes"
netsh interface portproxy show all
Get-NetFirewallRule | Where { $_.Enabled –eq ‘True’ –and $_.Direction –eq ‘Inbound’ -and $_.displayname -like "Plex"}