What version of Word are you using.
If you have 2003, try the following:
Edit, Find, ensure the "Find what:" is empty.
Tick the "Highlight all items found in" check box.
Click the More button, Style, slect the Style you want to find.
Find All.
Close Find Dialog. Copy and then paste the selection where you want it.
Prior to 2003 not all version have this option.
For 2007 go to Home tab, Editing Group.
Hope this works for you.
DeanH