In C/AL editor
I go to 'Page' >> 'Page Action' and see these variables.
I'd like to create a new ones like this so l go to 'C/AL Globals' like l used to do with the report.
But as you see, there is nothing even I checked on all 3 tabs (Variables, Text Constants or Functions).
Clicking on variable just lead me to its source. I have no clue now.