You can do one of two things. Put it in a cool area, water sparingly and let it go dormant (it will drop all or most of it's leaves), or put it in a sunny spot and grow it as a houseplant (it will still drop some leaves due to the changes in temps and humidity.) If you let it go dormant, it will take longer for it to start
growing again next year. Either way, you just remove any dead wood in
spring and set it back out.