How to define a global parameter and change its value

I would like to use a value from one of my template to pass to a
different template.

I tried to declare a global parameter and assign the value in the
template, so I can use it in a different template.
I can assign the value for the parameter in the template, but the
following template can not pick the changed value.  It still contains
the original value that I have initialized.  It seems to me that the
"global parameter" does not really work, the local one is always
"shadow" the global one.

Is there anyway that I can change the global parameter's value after it
has been declared, and used in different templates?

Thanks for the help

Chi@transcanada


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