After you lager in the carboy, you bottle the beer and allow it to carb up at room temperature.
I ferment at 48-50 degrees in primary, and then rack to the carboy when it's done and slowly lower the temp (5 degrees per day) until I'm at 34 degrees. I leave it at 34 degrees for about 4-6 weeks or so before I bottle.
Broken Leg Brewery
Giving beer a leg to stand on since 2006