Originally Posted by macropod

If these are multi-level list #s inserted by Word, you can't reference them that way - you need to change the numbering format. If they are not multi-level list #s inserted by Word, they probably should be changed to them (makes document maintenance much easier), but you can change all of them in one go via a wildcard Find/Replace, where:
Find = <[0-9]@.[0-9]@.[0-9]@>
Replace = ^&
and setting the replacement font format to Bold.