To group three switches together without
copying them, set all the switches to the same [Group Number].
You can place the same switch using [Copy] and
[Paste] without using [Duplicate].
For [Duplicate], you can create automatically
added copies of addresses depending on the [Assign Addresses] and
[Increment Each Address by] settings, but if you make switches
without consecutive addresses into a Group, you will need to change
the [Bit Address] of the 2nd and 3rd switch.