Fetch Field in one doctype to onther doctype

i create a two doctype item and customer in customer doctype i have pack price field i want fetch the base price field (item doctype) in to pack price(customer doctype) using script ply suggest me…

You probably dont even need script for this.

“Fetch from” does this. Fetch a Field Value from a Document into a Transaction

i try to fetch but i want to fetch parent doctype is (item) value in to child doctype is (customer doctype)