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Create or Modify an Environmental Variable with a script

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Last Modified: 2015-02-27
Hi

Was looking to create create an environmental variable to point to a licence server, however the script overwrites the existing values.
strComputer = "."
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")

Set objVariable = objWMIService.Get("Win32_Environment").SpawnInstance_

objVariable.Name = "LM_Licence_File"
objVariable.UserName = "<System>"
objVariable.VariableValue = "27004@servername"
objVariable.Put_

Is there a way to set it so that if the variable name already exists (in this case LM_Licence_File)it adds to it (except when the value already exists)
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