Well, you can use simple copy/paste.

EDIT:

You click on the "Select Tool" button


Usual selection with the cursor


Right Click

 

There are a couple of trial converters that convert PDF files to image files. Once they are converted to image files, convert them to CBDS files and view them on ComicBook DS

It's troublesome, but worth it IMO. Wait a minute, and I'll give you a link. The image to CBDS converter should be in the ComicBook DS zip file.

EDIT: http://www.mystikmedia.com/pdf_converter.htm