Adjust the levels of the table of content in Micosoft Word

When you create a table of content in Micorsoft Word, the number of levels is guven automatically. If you want to adjust the number of levels presented, say you want to display only 2 levels instead of 3, here is how to proceed:

1) Press "Alt+F9" to switch to code field mode

You will se something like {TOC \o "1-3" \h \z \u}

2) Replace the 3 by 2
3) Press "Alt+F9" again to go back in the normal mode
4) Refresh the table of content