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In the Electrical Index, expand the folder hierarchy Wiring Equipment > Panels.
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Right-click the Junction Boxes folder and then select New Junction Box.
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Accept the default item tag that is based on the naming convention for the junction box or type your own item tag according to the naming convention. See Using Naming Conventions.
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If required, right-click the junction box and select New Circuit to add a panel circuit.
Also, you can add a panel circuit by expanding the Typical Circuits folder in the Reference Data Explorer and dragging an existing typical panel circuit 
to the junction box.
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Right-click the circuit and on the shortcut menu, select an option to create new disconnect, protection, converting or control equipment.
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Repeat the previous step as often as needed to create additional items for the circuit.