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Only use bsys to create a subsystem

There are four types of subsystem:

1. Bus;
2. Area;
3. Owner; and
4. Zone.

Only the bus subsystem is used in the psspy subsystem data retrieval commands. The other three are used for reporting from the GUI:

Power Flow > Reports > Area / Owner / Zone totals.. 

Changing the area subsystem has no effect on the area selections of the current bus subsystem.

The answer for this was found in Chapter 4.8 - Subsystem Selection in the Program Operation Manual.