Is your TOC too long? Maybe the first two levels (TOC 1, and TOC 2) are all you need for your document.
The Show levels box in the Table of Contents dialog box is where you can choose the number of hierarchical levels you want displayed in your TOC. You can have up to nine levels.
Shorten your TOC by lowering the number; lengthen your TOC by increasing the number. You can look in the Print Preview or Web Preview area to see your changes before you apply them. When you're sure it's what you want, just click OK twice.