Adding Existing Configurations to a Network Specification
You can add existing network configurations to a Network specification. The network configuration and the Network specification do not have to be in the same project.
To add an existing network configuration to a Network specification:
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                     Open a Network Specification entity in the Network Specification editor. See "Creating New Specifications" for information about creating new Network specifications. 
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                     Click the Network Configurations tab. 
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                     Click Select. The Add Entity dialog box appears. 
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                     Select the network configuration and click OK. The Network Configuration specification is added to the Network specification's Network Configurations tab. 
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                     From the File menu, select Save.