Q: I am looking for a sample program which can demonstrate how to copy
a
area of a PDF and then place the copied area in to a new PDF file
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A: As a starting point you may want to take a look at ElementEdit
sample project (http://www.pdftron.com/pdfnet/
samplecode.html#ElementEdit).
The sample shows how to remove images and change text color in PDF,
however you can tweak the code so that only element within given
region/rectangle are copied on the target page. To obtain a bounding
box for an element use element.GetBBox(rect). To test for rectangle
intersection use rect.IntersectRect(r1, r2).