Hi, MIYA. If sheraton you mean is the one located at Great China International Exchange Square, you can take metro line 4 at Entrance E convention and exhibition center for 2 stops, then get off at Exit B futian port (Lok Ma Chau on hk side). Maybe just walk a few miles, then you can take MTR east rail at Lok Ma Chau and get off at East Tsim Sha Zui. later, taking a metro or taxi, it would be easy to help you reach where you want. For the details to take a metro to wanchai, you might get information on following website. Hope can help.
http://www.mtr.com.hk/chi/train/system_map_pop_up.html