wp_summary will automagically show a summary of your post at its beginning, using h1, h2 and h3 tags to create sections.
Plugin Tag: the_content
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Content Parts
Divide your post content into parts that you can show in different areas of your theme templates.
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Nested Shortcodes by Outerbridge
A small plugin which allows you to use nest shortcodes (i.e. a shortcode within an enclosing shortcode) by implementing a simple do_shortcode filter