WD How extract pages from a pdf file

Hello to all

I have a big pdf file that contains about 9 pages per person.
I need to extract the range of pages (1-9, 10-18, etc etc) from the whole pdf and this is quite easy using the "pdfExtractPage" function that produce an image that i store in hidden image control.
I then have 9 images that contains the pages extracted, and i want to merge these images in a new single pdf file.
I was trying the "idestination (iGenericPDF, sPdfOutput) to set the output file, but how to pass each image as they were single pdf page?
Do i need to create a "report" with a big image control inside or is there another way to sort this problem??
Tips and trick are appreciated..
Thanks in advance
Dirk