Creating Index Entries
Click in a word, or select the words in your document that you want to use as an index entry.
From the Insert menu, choose Indexes and Tables > Entry, and do one of the following:
To change the text that appears in the index, type the text that you want in the Entry box. The text that you type here does not replace the selected text in the document.
To add an index mark to similar words in your document, select Apply to all similar texts.
To add the entries to a custom index, click the New User-defined Index icon, enter the name of the index.
Click OK.