Yup, dissassemble, cut and reassemble, but how thick is the glass and also depends on if it is tempered or not. May want to consult a pro if cutting thicker glass.
in my experience anything under a 1/4" thick as long as its not tempered you can score a line and snap it but if over 1/4" your forking out the $ for a pro to cut it with a diamond blade which isnt too bad considering a low vibration saw and diamond blade will run you 3 grand lol