You can use File > Test Settings > Generate Script to get this done programmatically ( First make sure that you define atleast one "userdefined" variable under Environment variable settings) ---of course you need to tweak the code to make it work for you.
Otherwise you can do a workaround also,
Overwrite the environment variable and where overwriting is not taking place make them blank.
Otherwise you can do a workaround also,
Overwrite the environment variable and where overwriting is not taking place make them blank.
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