Restricted Data Enty

Hi there,
I have a with Work hour list. once I enter the name or the work code I would like a message coming up if the name or the work code are not in the related tables-so I am not able to enter anything that is not in the list. It should asked of I want to do a new entry if I press yes the form for the New Employee entry or the form for the new Work code should come up.

CAn you help?