Proxy to file scenario ( pls gve me some inputs )

I am Doing proxy to file scenario. i have some quries i want some suggestions regarding this scenario.

Source is proxy and Target is File . i want to generate 6 files with same structure and different different filenames . I guess have to put condition in interface determination? is it correct? if it is correct what condition i have to put plz give me suggestions .

filenames also generate different different names how it could be done in dynamic configuration? plz give me some inputs regarding this.

Thanks

Regards

Tahir