How to get subchapternumbering in Word 2007

[Pensionada]

I feel like a complete fool but I cannot get subchapter numbering right in Word 2007.

I have this large and complex document that I created with only 2 levels: level 1 had numbering from the beginning; level 2 was set up without numbering, but I now need to number the level 2's also.

But whatever I do, I cannot get the numbering for this new level right.

Please advise.

PS I know how to do it in Word 2003 so I saved the whole 70 pages as doc and read them in Word2003 which I still have on an older computer. This made a complete mess of all the embedded pictures (a little incompatibility, I guess) so that is no fallback either.