如何在sql server中的视图中定义新字段

I am creating a view based on another table but there are also new fields in the view that are not in the table, The person who did the view did it like this "Null as Newfield". I want the field to be set to Null but I want the field to be Varchar(1) instead I got a int field. I'm not sure of the exact syntax to make this happen. I cannot find an example. I am creating a view based on another table but