I have a form that allows users to add records by first selecting 'A' from dropdown1 and then 'B' from dropdown2 and finally 'C' from dropdown3. Because this record is made up of selections from dropdowns it has no name or unique identifier other than the hidden ID created automatically. 

What I'd like is to create a single line field that would be automatically populated based on the choices made in dropdown1, 2, and 3. In the example above my new record would be called "A-B-C." Once this record had a name I could use that field in the bidirectional relationships that it's mapped with. 

Please assist.

Thanks,

Brent