Adding exteranally-created index

[Rich Shepard]

A book index can contain more than words found in the body; for example,
concepts that are not single words but might well be what a reader seeks
from the index.

I've created an index externally and it has abbreviations and terms not
necessarily in the text body but could be what a reader seeks to find. Is
there a way for me to add the index? Perhaps by manually adding a 2-column
unnumbered chapter after the bibliography?

TIA,

Rich