I looked at the link you provided (http://office.microsoft.com/en-us/
word/HP051861901033.aspx?pid=CH061047291033) and it says:

"The easiest way to insert SEQ fields to number tables, figures, and
other items in a document is to use the Caption command (Insert menu,
Reference submenu). "

In other words, I need to create an extra button for this? I wouldn't
get this style to appear along with my other styles?

In this case I find it better to include my tenth style with the
others and add an extra button for "restart numbering", which is what
I was trying to avoid in the first place.

Is this the best I can do?

Åsa