Purchase Receipt table

I’ve used Customize Form to add a field to Item. Now I would like to fetch this field when I add an existing item to a Purchase Receipt.
I’ve also added the field to Purchase Receipt Item using Customize Form. But could not figure out how to populate it automatically from the Item.
How could I do it?

You can refer to the following:


Or more simply,

Go to Purchase Invoice Item in customize form. Navigate to the custom field, expand, and in the Options field enter : item.field_name_you_are_pulling_data_from

Thanks very much. But what if the field in Item is a Link to a custom doctype?
If I set the type of the field in Purchase Receipt Item as Link, the Options field only accepts the Doctype name, not the field from the Item.