Can i put a six speed manual transmission in 5 speed 2002 bmw 330i

It can be done, but you'll need a few parts for it. Trans (obviously), flywheel, clutch, shift-linkage (for the trans you're using), driveshaft/CSB, and trans brace. You'll also want to look around at BMW specific forums for the little details, like whether or not you'll want to get a new differential to match the ratios of the six-speed. Make sure you do all your research before you start ordering parts!