función "if" con algún caracter que cumpla la condición

función "if" con algún caracter que cumpla la condición

Saludos.
He usado la Función If con operador ">", "<" o con referencia de cadena de textos exactas.
Mi solicitud en esta ocasión es la siguiente:
Tengo un Campo de cadena de texto con varias palabras pero deseo categorizar esta información en un nuevo campo utilizando la función ÏF".
Coloco un ejemplo para traficar la pregunta.
Tipo de Estudio                  Área
Rx TORAX                                                      Tórax      EXPRESION: (if "tipo de estudio"contiene "torax", "Tórax", "XX")
RX TORAX P.A Y LATERAL                           Tórax  
RX TORAX PA.                                                Tórax
Utrasonido  Tiroideo                                          XX

Gracias y Happy New Year.


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