Sorry, you can't. PRE does not 'smart render' - it always re-renders your entire project when Sharing. There are other video editors that do perform smart rendering (Sony Vegas and Magix Movie Edit Pro come to mind). The free GPL virtualdub can "Remove segments of a video clip and save the rest, without recompressing."
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And also remember that "smart rendering" only applies to footage, that has just been shortened, or joined, i.e. if you add Transitions, overlay (Titles or PiP), or Effects, then you will still have to Render/Trnascode those parts on Export. For the pure Trimming and joining, VirtualDub would be the easiest way to go.
Then, when you are done, you can use any number of DVD/BD authoring programs to create a BD from 100% BD-compliant (very important) material. Though I have not used it, DVD Architect gets high marks from others.
Thanks a lot
thanks a lot for your answer.
You are most welcome and happy editing,