Template:ToC limit
Usage
[change source]{{TOClimit|limit=3}} This template inserts a Table of Contents which omits subheadings lower than a certain level. The table obeys the same layout rules as the __TOC__ magic word. You can specify the limit with the limit parameter; for instance, limit=3 allows ===subheadings=== but omits any subheadings below that from the TOC (they still have section edit links, however; the main use for this template is situations where you want section edit links for ease of editing but don't want to clutter the table of contents).
The template works by hiding the lower levels with CSS. See MediaWiki:Common.css.