Fetch Child Table value

i have this child table and want to get their documents/ fetch their values to get on parent table but it is not providing me that in erpnext and i had created a relationship like on parent doctype i had created a field with field type table and in option i had write the child table doctype name but when i created the document they are not providing me the document but it provide the child table field for e.g i have 03 field 02 fieldtype are link in child doctype so in parent doctype the table with connect the child table with the parent doctype had showing me the refrence of that link doctype of child table but i want the i save document on child table that document value will fetch on linked table in parent doctype

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kindly help me in this ASAP