How do I use the Style Sheet to change the options of all cells of a given style?

To understand the style sheets, you must first understand how options are inherited.

http://support.wolfram.com/mathematica/interface/options/inheritance.html

You can select a Shared Style Sheet through the menu command Format > Style Sheet.

The Style Sheet can be changed through the menu command Format > Edit Style Sheet.

A dialog will appear giving you a choice between editting two different kinds of style sheets.

http://support.wolfram.com/mathematica/interface/options/sharedvsprivate.html

Once you have selected which style sheet to edit, a notebook of all the style definitions will appear. You must select the cell bracket of the cell style you want to edit. Then, change the options of this cell with menu commands or the Option Inspector with "Show option values for" set to "selection".

http://support.wolfram.com/mathematica/interface/options/inspector.html

Alternatively, you can create or edit a Private Style Sheet (without actually opening the style sheet) by selecting in your notebook a cell of the correct type and changing options in the Option Inspector with "Show option values for" set to "selection's style".

The default style sheet for a new notebook is "Default". If you wish to change the default styles of new notebooks, it is not recommended that you edit the Default style sheet. Instead, you can change which style sheet is used as the default.

http://support.wolfram.com/mathematica/interface/options/changedefaultstyles.html

Download this FAQ as a Mathematica 5.2 Notebook

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