How do I make a Hash variable name a variable?

For MT5:
My category page template needs to create different hash variables for the category in context as well as any subcategories. So I figure to just make the hash name a variable.

It seems impossible to do this. I know how to concatenate the with the word Hash or some other unique little string, but I can't make that a name of a hash variable.

I have tried everything I can think of, including making the unique variable have a value with braces in like cat1Hash{} and then try to use that, but nothing seems to work, not Var, setVar, not SetHash not set SetVarBlock. Nothing seems to accept a variable as a hash name.

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