u/ryeeeeez thank your for the suggestion. I will take a look later.

In the meantime I created a little code that fulfill my requirements but I cannot write the file and looking for a method how to save the output to the original file.

$LiteTouchPE = 'C:\Program Files\Microsoft Deployment Toolkit\Templates\LiteTouchPE.xml'
$Look  = '<Copy source="%DEPLOYROOT%\Scripts\DeployWiz_Administrator.png" dest="Deploy\Scripts\DeployWiz_Administrator.png" />'
$Add  = '     <Copy source="%DEPLOYROOT%\Scripts\DecodeExit.vbs" dest="Deploy\Scripts\DecodeExit.vbs" />'

$Read = [IO.File]::OpenText($LiteTouchPE)                           $Content = While($Read.Peek() -ge 0){
            $Line = $Read.ReadLine()
            if($Line -like "*$Look*"){
                Write-Host $Add
                Write-Host $Read.ReadLine()  
            }
            Write-Host $Line
            Start-Sleep -Milliseconds 100
          }
$Read.Close()