You can't delete Word's built-in styles. You can add your own, you can give
them priority over the built-in ones (by giving them a higher recommendation
level), you can even hide the built-in ones (see the Manage Styles dialog
for these options), but it is generally much easier to work with the
built-in styles, modifying them as required. This is especially recommended
for Word's built-in heading styles, which have numerous "magic" properties;
see
http://www.shaunakelly.com/word/numbering/UseBuiltInHeadingStyles.html.
Note that, when you modify a style in a given document, you are modifying it
only for that document unless you explicitly select the radio button for
"New documents based on this template." It is also recommended that, instead
of creating a new Blank Document based on Normal.dotm, you create specific
document templates designed expressly for the types of documents you want to
create.
--
Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
http://word.mvps.org
"Reluctant Publisher User"