If you use bleach to 'shock' and trichlor in a floater to hold a decent FC (free chlorine) level, you can run your CYA anywhere from 40 to 100 ppm. At higher levels, you'll need to raise your chlorine level to compensate -- but you'll be able to go multiple days without adding chlorine, which is nice if you have to leave the pool for a few days.

An easy way to handle it is to do what it takes to get to CYA=40ppm, and then use trichlor and bleach and let it climb slowly. Just remember to adjust your chlorine level upwards as the CYA goes up. ('Best Guess' chart link in my sig)