Convert VBS to Powershell - Copies a file from one network location to another using SCCM

Recently I was requested to change the below to PowerShell because I was having problems getting it to pass the value that gets entered when we do OS Deployment. We think it may work if we try running it as Powershell. Can someone help please? Thank you!

dim filesys, objEnv
set filesys=CreateObject("Scripting.FileSystemObject")
set objEnv=CreateObject("Microsoft.SMS.TSEnvironment") 
strTicketNumber = objEnv("TICKETNUMBER")
If filesys.FileExists("\\CONTOSO\Documentation\file.xlsm") Then
filesys.CopyFile "\\CONTOSO\Documentation\file.xlsm", "\\CONTOSO\Documentation\new folder\" & strTicketNumber & ".xlsm"
End If

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