in Excel, there's a simple function called ROMAN() you can use.
In Word, well, it certainly depends what kind of numbering you want to
have: ordinary list/outline numbering can be roman, and for any
field-based numbering, you can add a field switch.
Do you mean Arabic-alphabet numerals? Install an Arabic font, and in
the Control Panel > Regional and Language Codings, choose the format
for your numerals on the first pane that appears.
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