Locate the Simplified Chinese font file you want to edit in BDF format.
Its encoding should start at 8481 (0x2121). For example, say you have a BDF file such as myfont14.bdf:
STARTFONT 2.1 COMMENT Sample Font FONT Myfont-Medium14 SIZE 14 75 75... STARTCHAR C101 ENCODING 8481 ... |