Any part of a page can be saved
as a library item and reused:
Select portion of the page
Choose Modify, then Library,
then Add Object to Library
The Library in DW 4 is in the
"Assets" tab of the Reference window. Click on the orange folder
(Assets)
and then the open book:

To add the item to a page, choose
Window, then Library, then drag item onto page.
For example, the following table
is a library item:
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This table
is an . . .
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. . .example
of a . . .
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. . . library
item.
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Library items are stored in a
special folder inside your local root directory, called Library. All library
items have the extension *.lbi.
Open your Assets/Library, the
item should be there. If not, right click and choose Recreate Site List.
Once a selection is a library
item, it cannot be edited except in the library. (If you try to edit it,
it will turn grey and your property inspector will indicate it is a library
item.
Double-click on the listing in
the Library window. (Or right-click and use Edit.)
Edit. Notice certain functions
are not enabled (such as page properties). When you exit the window it will
ask if you want to save; then it will ask you if you want to update the
item in all its locations. Generally, you will say Yes. (Even "open"
files will be updated.)
You can only include elements
in libraries that would go between a page's <body> and </body>
tags.
Activity: Create your own
library item. Place it onto another page within your site.