A family of Microsoft word processing software products for creating web, email, and print documents.
Expanding on the Reply from Charles:
When you create a Custom Style it is saved only to the document in which you create it unless you check the box labeled Add to Template in the lower left corner of the Create New Style.../Modify Style dialog. If that box is checked the Style will be available in any new documents based on that template going forward.
As an alternative to using Organizer you can open a document in which the Styles have been stored then go into Format> Style> Modify Style dialog to tick the check box. Organizer is more efficient if there are more than 3-4 Styles to be modified.