set field with concatinated field values

[dmcdivitt]

model-driven app

I have a Pharmacy Contact entity with "Last Name", "First Name", "Middle Initial", and "Full Name" fields. The full name field is the default name field automatically added when the entity is created, displayed at the top of the main form, and displayed in look up lists. In a business rule I want to write Last name + ", " + First Name + " " + Middle Initial into Full name. Unfortunately there seems no way to do that. When setting a value, one other field can be chosen to read from, or literal text can be used. There is no way to concatinate fields into a value. Is this true? Is there a way to do what I want?

[dmcdivitt]

I'm trying to do this as a process, but don't know if it's possible.