(MSWord2010)Making your own headings and subheading (MSWord2010)

[BensMSOffice]

Hi,

I am making a document for which I want to have my own headings. I have learned how to do this by starting at the "numbering" feature and then going to the ribbon and clicking "Update head X to match selection". I have been able to create a heading that is like "Heading 1" and save it as Heading2 type. Then when I press the Heading2 ribbon button, I get a heading "HeadingX" where X is the particular number of that particular instance of the heading.
What I have not been able to do is create a subheading of the form "Heading 1.2" and save that under the Heading2 type. With that, I could create a Heading2 type which would appear as "Heading 3" (say) and then under it I could create a subheading which would be "Heading 3.1". With this, i can have all these show up in my table of contents.
Please help if you have been able to do this.

Ben