Feature request: supply VARIABLES for common targets

I had been OPENING the target file in Preview but switched to PDF Element Pro. I had a problem with PDF Element and switched BACK to Preview, but then the problem was resolved and I needed to switch back again - if Hazel could provide VARIABLES for something commonly used and defined in a variables LIST, only the target of the variable need be changed so ALL rules using it would be affected by a one-line change. Of course, this DOES sound like a 'one-off'. But there are seeming one-offs that pop-up again - and I keep MISSING rules that need changing!!!