Bounding gridview columns.

I have a gridview at design time , which has 6 columns, 4 are bounded to a table in my database and the other 2 are unbounded, At run time I save the data entered the the unbounded columns and save it with the bounded into another table in my database . When I wahm to show the data in my gridview form the new tabel the unbounded columns are left empty. How do I solve this.