Key Field Value for File Adapter Sender Wildcard

Hello everybody, is there a way to use a wildcard for the property of NamA.keyFieldValue in the cc for a Fils Sender????, here's an example why, I need to take some Files via PI 7.0 and my key filed can change according to the file an example is that in a file can be HF28 and in another file can be HF29, the only character that is going to be constant is the H, I would really appreciate any suggestions, thanks in advance.

Regards,

Julio Cesar