It seems that right now, all that a subfolder does is put your drawings in a group, with no real function. Why can't ACAD make the subfolders so that we can create subfolders in a project for each panel in a project, so that each panel can have the same wire numbers and tag numbers as all the other panels but ACAD knows that they are in different panels(subfolders). ACAD could just add a code like they do for location and installation, so that it knows that wire number 1 in panel A is different than wire number 1 in Panel B, even though they are in the same project. It would also make it possible to use the source/destination and parent/sibling tagging over multiple subfolders. They can also add a selection in the main folder properties where you can select whether the subfolders are to be independent of each other or treated as one unit.
We do projects that contain 8 to 10 different panels and we have to create a different project for each one. That means we have to manually add any contacts, wires, or PLCs that originate from a different panel
It does not seem to me that this would be very complicated, especially for the money we pay every year to use this.