I'm creating an index, and need a template of a concordance file per the
below. This would help creating such a file, to have a sample one up and
available. It might be a nice thing for Microsoft to post on the templates
site too.

1. Click Insert Table Button image on the Standard toolbar (toolbar: A
bar with buttons and options that you use to carry out commands. To display a
toolbar, click Customize on the Tools menu, and then click the Toolbars tab.).
2. Drag to select two columns.
3. In the first column, enter the text you want Microsoft Word to search
for and mark as an index entry. Make sure to enter the text exactly as it
appears in the document. Then press TAB.
4. In the second column, type the index entry for the text in the first
column. Then press TAB. If you want to create a subentry (subentry: An index
entry that falls under a more general heading. For example, the index entry
"planets" could have the subentries "Mars" and "Venus."), type the main entry
followed by a colon ( and the subentry.
5. Repeat steps 3 and 4 for each index reference and entry.
6. Save the concordance file.

Tips
* To make sure Word marks all the text you want to index, list all forms
of the text you want to search for. For example, type erupt, erupting, and
eruption in three separate cells in the left column, and then type volcanoes
in the matching cells in the right column.