It IS a TOC unless you have things in your document so that 1.305 is followed by 7.203 followed by 2.715 followed by 1.307. Then you might want an Index, but I am a lawyer and have been a department head charged with generating rules. If a statute book or rule book were so organized, we would be re-organizing post-haste, and not just the document.

If it is a document describing some various rules people might want to be cognizant of and not laid out in sequential order, than an index would be useful. However, it would not be organized quite like you are showing. Indices - Complex Documents

You can have partial Tables of Contents that appear in places other than in the front matter such as at the beginning of chapters. See TOC Tips and Tricks by Suzanne Barnhill, MVP on creating a TOC for part of a document.