Tables :: Hide Data - Show First Three Letters Of Last Name In Table

I am creating a database for an ambulance organization to track call history. One of the fields that needs to be populated is patient's last name. I need to show the last name when printing the form for billing purpose. However, I only want to shoe the first three letters of the last name in the table. For example, if the patients last name is Smith. When printing the form I would see the name Smith, but in the table I would only see Smi**.