You can have dynamic fields by services
Custom Service Form for OTRS (Formulário Personalizado por Serviço OTRS) – English version
You can have dynamic fields by services
Dicas de ITSM com OTOBO e Znuny
Blog com dicas para seu Znuny e OTOBO, AddOns, Help Desk e ITSM
Dicas de ITSM com OTOBO e Znuny 