This is how you may insert subscript symbols in Word using Alt code.
#EXCEL KEYBOARD SHORTCUT FOR SUBSCRIPT CODE#
Type 00B2 on your keyboard, then press Alt + X. To use this shortcut, obey the following instructions: Place the insertion pointer in the right place.
#EXCEL KEYBOARD SHORTCUT FOR SUBSCRIPT PLUS#
If you are using the older version of Word on Mac, press Command ⌘ plus the minus sign (-) instead.