If you are not using the Korean language version of Microsoft Office, then this feature is only available if you have installed the Microsoft Office XP Multilingual User Interface Pack or Microsoft Office Proofing Tools for Korean. In addition, you must enable support for Korean through Microsoft Office Language Settings.
If any Hanja, such as a name of a place or a person, is not listed in the Hanja Suggestions box of the Hangul Hanja Conversion dialog box, a user-defined word can be added to the Hanja list in a custom dictionary, and then displayed there.
Add Hanja to custom dictionaries
Delete Hanja from custom dictionaries