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This option allow you to copy a whole network node to a new one, so you don't have to enter each range and each device in the new network.
This way you can use a network organization as "model" to new ones.
When you press the button, you will see the following window:

You simply enter the destination IP number, and the new network name, and the whole branch will be copied.
The specific data for each device won't be copied; you will enter later each device to fill the particular data.