Journals in my field (linguistics) require headings of the following style:

1
1.1
1.2
2
2.1
2.1.1
2.1.2
2.2

I have just finished an article which I want to submit to such a journal,
but my headings (which I dutifully built using the official Word Heading1,
Heading2, etc. styles) don't have the numbers in front. How do I put them
there?

The journal I want to submit to, which requires headings like that, has a
template.dot file you can download and attach, and as you know, one can
request that the template apply to the document right away (a check box).
When I did that, it changed all the typefaces and fontsizes of my headings to
match theirs, so it recognizes which of my headings are 1, 2, etc. But it did
not add the little numbers to the left of them.

Previous questions I have asked in this forum lead me to suspect that what I
must do is define a style, in some way using the Bullets and Numbering
dialog, which has an option with numbers which look like that - but how?

And note that what I need to do is not just start with a plain vanilla
Heading1, Heading2, etc. and modify that; I need to get the typefaces, fonts,
etc. which go with their headings.

Thanks,

Peyton Todd