Linq select many from list and keep id

This example applies to if you want to select the id from class A and all flatten list elements from “ListB”:

public class A
int Id {get; set;}
List ListB {get; set;}

var _listItems = (from x in _orgList
.SelectMany(x => x.ListObjects, (Product, Param) =>
new { Product, Param })
select new { }

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