How I could make child devices?

How I could make child devices?
With the multi master switch code but it doesn’t woks in local…
Would you guide me, please?

Thank you but, when I use that code with CLI tool it doesn’t works on the local hub.
For example I made a new one as like { mfr = “DAWON_DNS”, model = “PM-S2401-ZB”, children = 1 } and edit a fingerprint information either.
Packaging and install that code but only one device registered.
Is there any code needed additionally for operate on local hub?