I have a very simple problem in Word 2010.

I have a document with a Table of Contents, and I have the following items:

1. Title 1
 [some text]
  1.1 Title 1.1
   [some text]

I simply want to add an item 1.2.

If I go at the end of Title 1.1 and press enter, an item 1.2 appears below it, but the text regarding item 1.1 stays below it all.

I somehow used to be able to do it on word 2007, but I can't remember what I used to do, and before struggling in it for too long, I remembered SuperUser.

Can someone answer this and maybe additionally link me to a tutorial on this ?
Every one I find talks about having a text already numbered and adding a TOC in the beginning. I want to build the text all over the TOC.