Add Device to Junction Box
To connect devices to a junction box, go to
Ribbon: 
Add Device to Junction Box
Pulldown Menu:
You will be prompted to select the junction box.
Select junction box:
You will then be prompted to select the devices you want to associate with the junction box.
Select objects:
The selected junction box and devices will be associated with each other. When loops are drawn using the Draw Homerun and Loops command, loops will be drawn from the associated devices to the junction box, and from the junction box to other devices on the circuit. Loops will not be drawn from the associated devices to other devices.
If the device was previously connected to a different junction box, it will be connected to this junction box. You do not need to disconnect the device from the old junction box before connecting it to a new junction box.
Although the drawing indicates the junction box and devices are associated by the loops drawn, this command will not circuit devices. You still need to connect the devices to the appropriate circuit.