You can import any text file, including text in HTML documents, into a slide.
In the place where you want to insert the text, choose Slide - Insert Slide from File Page - Insert Page from File.
Select "Text" or "HTML Document" as the File type.
Locate the file containing the text that you want to add, and then click Insert.
If the text file contains more text than can be inserted into a single slide, you can divide the text over several slides.
Double-click in the inserted text to enter edit mode.
Select all of the text that lies below the visible slide area and press Ctrl+X.
Choose Slide - New SlidePage - New Page, and then press Ctrl+V.
Repeat steps 1 to 3 until all of the text is on slides.