Global variable acessible to all (or a group of) workflows

Hello,

I need to create a global variable that can be shared amongst all workflows I have, or at least to a group of workflows available. Is it possible?

The reason is that I need to share some information like the directory path to each my workflows, and if that path is changed, for instance, I need to change that on every workflow. If that is global to all workflows, I can avoid this work and some derived mistakes.

Thanks!