A Word document will never make a good PowerPoint presentation. In any event,
you need to decide which text goes on which slides. You can take your Word
document and turn it into an "outline." Make the text that you want to be
slide titles and set it to the Heading1 style. Then edit like crazy and leave
the text you want on the body of the slide as Normal style. Alternatively,
put slide title text at the left margin and body slide text tabbed 1 tab in.
Then choose File> Open, and choose All Outlines from the Files of Type
drop-down list. You'll get a presentation with the text on each slide as you
specified. You'll have to copy and paste the images.
But again, I want to emphasize that a 20-page Word document won't make an
effective presentation. They're 2 different types of media. Imagine taking
your 20-page document and putting on video and showing it as a movie!
Ellen Finkelstein