Frappe data migration tool child tables

Hello beautiful people,

I’m having a hard time understanding how to use Frappe’s data migration tool for child tables.
I see there is an option, but there is no documentation.
Do you know how I can use it?

try the data import beta

I’m talking about the beta

there is a youtube video explaining the data import beta

Sorry i meant i am talking about the data migration beta

I have the same problem. What does Childtable do and how do i populate it? For example if i want to add items into a Childtable but my remote Source just give me the needed variable separate.