Hi I'm using Word 2003 & XP Home

I set up various heading styles in a word template (using styles and
formatting). Then I changed my mind about headings 8 to 10 and would like to
delete these. But the delete option is greyed out. I would have thought it
was because these styles are in use - but they're not. Does anyone know how I
can get rid of the ones I don't want?
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Many thanks
JD