global variable that can be reached in any of the bot's templates

Pardon me for the basic question,but here we go:

Im trying to define a global variable in a self script that I can access in the bot´s response templates. I was searching the scripts but couldnt find, at least in a way it works. Im probably missing something.  I've tried something like the code below:

state MyScript {
    pattern "create variable" template createIt();

    function createIt() {
        #myVar="whatever in it";
    }
}

Then Im trying to use {#myVar}, for example, in some response definition like this {#myVar}. Please could you tell me how could it be done and what Im doing wrong?

Thank you in advance !

Silas