Listen, I dont need you to tell me how IIF works, NZ works the same or better for this "problem"
Please see attached sample for your intrest, just to show you in a query and a form how it works.
This works, dont know what you are doing wrong, but its something.[/QUOT
Ahahaa!

I'm sorry Sir if I too much bothering you... anyway I get your point.. & I admit is my fault.. you want me to make a expression in query.. while I'm doing your given expression in Table field.. hehehhe!

I'm sorry for that.. I get.. I will modify again from the beginning my database I will follow your given sample.. but sir please see the attached sample database I created...
Thank you so much.. & more power!!