Can't delete some design variables from a file in HFSS

Hi there
I am trying to delete some design variable from my file but hfss keep telling me cannot delete them because it is been used by another variable or object
I am sure it is not
even when saving the file in different name the proplem still the same
Any idea will be apreciated
Many thanks

You have to delete every instance of that
variable. even if you did a copy or clonage
of a object where that variable once was ,
you have to delete it. Or if you put in as an
optimetric variable.

Before you delete the variables, you must save the project. After this, you can do that.