Hello, Klas!
I am grateful for your attention and help.
During the last night, after some tests, I got a solution without the need to override the form.
As I said, I have a simple selection department, with the options (Locação, Venda and Compra). I created three emails fields for recipients (Locação,Venda and Compra). For each of these email fields established a conditional:
Email for Locação=== Conditional state (is enable when departament is equal Locação;
Email for Venda=== Conditional state (is enable when departament is equal Venda;
Email for Compra=== Conditional state (is enable when departament is equal Compra;
These e-mail fields to the recipients are in the hidden position. I tested and worked perfectly.
OBS .: I do not know why, but if we put the email fields in any other position with variation (hidden) conditional will not work.
Again thank you for your guidance.
Cleber