Just pour the dry hops through the carboy opening a few days (or more) once fermentation has stopped. If you're using pellet hops, that will be easy. Whole hops can be more trouble. If your using whole hops you might want to either get a hop bag, or cover the end of your racking cane when you transfer to bottling bucket.
I wouldn't transfer to another fermented just to dry hop. That's another step that's not needed.
For the record, I dry hop in serving keg now. I simply put the whole hops into a hop bag and put them into the corny keg right before it goes into the brew fridge for chilling and carbonating. I'm not the only person that does this. One big benefit is you have that dry hop goodness for the entire keg and you don't need to remove the hop bag until your cleaning the empty keg.