Accessing subproject variable in Zenon Logic

Accessing subproject variable in Zenon Logic

Hi,

I've been trying out Zenon Logic for a short period of time but I've encountered a problem in my workflow.
For better overview and seperation in our projects, everything is divided in subprojects, and this has been working out really good.

But I wanted to make a sum of alarms for all of the main- and subprojects that a single customer has.

- Main Project
- Sub Project 01
- Sub Project 02

Settings variables "externally visible" in the subprojects do not make them visible in the main project.
How can I overcome this?

Thanks in advance.
Twan