Will it be possible to open PDF files and insert pages from it in the PDF document created in xojo ?
Right now you can create PDF Documents from Scratch in Xojo using the supported Methods and Properties from the Graphics class; but it is not an editor able to open PDF files created with other tools and copy elements from it in order to add them to a PDFDocument instance.
I have one more question. When inserting a jpeg image in PDFDocument, will the embedded profile be in tact ?
You may want to look into MBS Xojo DynaPDF Plugin, where the Lite version allows to import PDF pages.
For single page import or rendering, you can get the Pro version.