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Hello Team,
please find the below image, How to edit the given locked parameter.
First question is why do you need to unlock it?
Your system admin has enabled MC for a reason and the locked MC parameters are created by the MC software.
If you disable MC, restart Creo, then maybe it will allow you to delete the MC parameters.
As a system admin, I know I cannot delete them in a normal session of Creo and I have not tried with MC disabled.