You could use an { EQ \o(n,4)} field.

VaniNarayana wrote:

Dear friends,

I am typing up a chapter in Mathematics and would like to present fractions
in a vertical format. That is, I don't want to write "n/4", but want to write
"n", a line under it, and then 4 under the line. (Version: Word 2000)

Could you please let me know if and how this can be done? Really appreciate
it.

Best regards,
Vani Aswathanarayana