Creating centralized web parts.

John, what do mean create web parts on every page?

Are you talking about creating ad-hoc template for each page, and add web parts on them? You can certainly create re-usable template with web parts configured dynamically or with EditableText web part, so multiple pages can share the same template.

You can manage this within your page templates specifically NOT the individual pages. If you use a master page template and nest other templates below it you can have these webparts managed pretty easy. It's more of a conceptual process than anything and really have to understand Kentico's templates and layouts to take advantage of it.

Here is a good documentation page showing how to inherit portal engine content using page templates.