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for me, I set 2 system separately with "Zone num" in sav file then go Power Flow---Topology---Delete network elements---remove buses form case---select bus subsystem---then select system #1 or #2 that I want to remove.Done.

for me, I set 2 system separately with "Zone num" in sav file then go Power Flow---Topology---Delete network elements---remove buses form case---select bus subsystem---then select system #1 or #2 by Zone Num that I want to remove.Done.