Ports - Dynamic File Transport Names?

[MESReportGuru]

I have BT creating a document based upon an XML input file. The problem is that this file contains numerous segments of data that should result in numerous output files instead of just one. The Mapper takes care of the logic I need to but it appears the limitation to create multiple output files is in the configuration of the Port Primary Transport. The transport type is file. It only allows me to hardcode in a single file name and I need the file name to be dynamic based on information from the map file.

Anyone ever encounter something like this? My assumption is that if there is a way around this it has to do with creating files using a method other than the primary transport type of file.