Thank you very much for prompt response and information you provided. Pardon me I did not make myself across.
My question is since I have created a plug-in for pdf output and installed it,
what should I do to make the transformation process point to this new plug-in so that the output appearance can be different?
I mean the current pdf output transformation points to this plug-in "org.dita.pdf2", which is DITA-OT default plug-in.
How can I make the transformation point to this new one, "com.example.print-pdf", which I have created following this procedure described in this link (http://www.dita-ot.org/2.0/readme/dita2 ... ation.html
Since I am also a newbie in html and css, I think I will go for "DITA For Print" at this moment.