Once you have installed Sun PDF Import Extension, OpenOffice will be able to open any PDF file, and it will be possible to modify it by means of different tools. What Sun PDF Import Extension does is import the PDF and open it with Draw, the vector graphs editor that forms part of OpenOffice. By means of this tool, you'll be able to change the text, insert charts or eliminate part of the text.
Once you have the document with the changes that you want, Sun PDF Import Extension allows you to export it to the ODF (Open Document Format) format, or to a hybrid PDF, which is a PDF that includes the ODF format, so that you will be able to open it with OpenOffice.
Expand the possibilities offered by OpenOffice with Sun PDF Import Extension.