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From the Authoring section of the action bar,
double-click General System
.
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Click the root General system node three times.
Three child systems nodes are created under the root General system node.
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Select General System
again to deactivate the command.
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Right-click the first child system and select Properties.
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In the Properties dialog box, enter an appropriate name (for
example, General System A) in the Reference and
Instance tabs.
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In the same way, enter appropriate names for the other child systems.
The system structure comprises a root
system and three child systems.