To add a shortcut keystroke, make sure Num Lock is turned on in Windows. Then hold down any combination of Shift and Ctrl (Windows) or Option, Shift, and Command (Mac OS), and press a number on the numeric keypad. You cannot use letters or non-keypad numbers for defining style shortcuts.
Знаешь, где это написано?
C:\Program%20Files\Adobe\InDesign%202.0\Help\1_4_7_2.html