Yes, this is possible - to do this you need to:

Set the Title style to your desired Outline level so it will be available in the Table of Contents:

  1. Open the Styles window (Alt+Ctrl+Shift+S)

  2. Scroll down to the Title style and select Modify... Word 2007: Modify the Title style

  3. Click the Format button and select Paragraph... Word 2007: Format the Paragraph styling

  4. Set the Outline level to your desired level Word 2007: Set Outline level

This will add the Title style to the options available in the Table of Contents builder.

To verify that the Title style will now be added to the Table of Contents:

  1. Choose the References tab

  2. Click Table of Contents

  3. Choose Insert Table of Contents...
    Word 2007: Insert Table of Contents

  4. Click the Options... button Word 2007: TOC Options

  5. Scroll through the Available styles: list to make sure that the Title style now shows up and that it has the desired TOC level
    Word 2007: Verify TOC level