As per Macropod's suggestion, I have decided to go ahead and insert suitable headings at the appropriate place in the document for the eight chapters (i.e. those eight which will not be getting published due to absence of sound file).

In this connection Macropod had written,

I am using heading 1 for all the other chapters; what heading should I use for these, and how do I set the TOC so as to not display the page # for that level?

I also have a couple of other related questions here:
1. In the TOC I would like to have a number preceding each chapter name, to give a running count of chapter number. That's pretty common I think so my guess is there may be a setting for that although I could not find it in the "edit field" options for the TOC.

2. This book is written using both Hindi and English. As such at the beginning of each chapter, the chapter title is provided in both languages: The top line in Hindi, and just underneath that in English. What I had done is to assign each of these two titles the status of "heading 1". As a result, in the TOC there are two listings for each chapter: One in Hindi, and then one in English. Both listings provide the same page number. Like this:

फ़सल का प्रबन्ध, वृष्टि के समय............................................... .........................62
Management of crops during rain.............................................. .............62

Is there a way for me to get the Hindi and English titles to appear in the TOC on a single line one following the other, with one page number listing? I tried going to the beginning of a chapter, highlighting both chapter names together, and assigning the heading 1 status to them together. But it seems that, perhaps due to their being on separate lines at the beginning of the chapter, Word assigns them separate heading status and separate lines in the TOC.

3. Optimally as mentioned I would like to have the two headings appear on the TOC on one line, separated by a back slash. For example, here is what I want:

फ़सल का प्रबन्ध, वृष्टि के समय / Management of crops during rain ......................62