Query on Inbound email process

Does anyone know if its possible to achieve the following with inbound email on ServiceDesk 7.4...?

Take the subject attribute of the email and split it into 2 parts

Part 1 would be a reference number contained in () that would be mapped to an external reference attribute

Part 2 would be some text relevant to the incident that would be mapped to the incident summary attribute

At the moment the only workaround I can see is to map the subject attribute to both attributes on the incident window

Thanks