Copying data from one doctype to another

How i can fetch multiple datas from one Doctype to another doctype, in GUi…

Can you specify with the help of a screenshot?

Lets say there are 3 Doctypes–A, B, C
in this B is child doctype…i am using this in Parent DT ‘A’ as table.
C is a basic Form which say take(name, age, address, city) values.
so i want to display these all values in A.