Each conversion task can only put the file into a single destination folder.
You can create a secondary monitor task to monitor your converted destination folder (make sure you check the remonitor converted files option in the expert settings) and then a secondary conversion task with the rename only option selected and a custom rename pattern to just move the file to a different location (make sure you link the secondary monitor task to the secondary conversion task in the expert settings)
The other way would be write a post custom command where you can run a batch script to copy the converted file to a location of your choice. See the advanced commands post for details on custom commands.