The ability to show the same terminal on more than one dwg within a project would be a large benifit.
For example, I design a large control board made up of many different panels. Each panel has it's own terminals and components. Not a problem with the terminals and wiring within the panel.
However, when doing a panel to panel connection diagram (or bus wiring diagram as us electricians call it) the panel terminals must be shown again within the project.
If only there was a way to do a parent/child connection between terminals shown in different dwgs for situations like this.
It would be able to change both terminals number or type in the one go when changes are made.
Cross referencing could be done so that wiring could be followed from panel 'A' through the bus wiring to panel 'B' to confirm wiring is going to the correct locations.
I'm sure that there are many other benifits as well.
Regards Brad