Hi Gilberto,
Thank you for your interest in Syncfusion Products.
We can able to add any number of pages to the Pdf document.
Please use the below code snippet:
PdfDocument.Pages.Add();
You can also split a Pdf Document into two Pdf documents.
Please refer the below sample.
http://asp.syncfusion.com/Windows/demos/reporting/pdf/Modify%20Documents/Split%20Document/Sample.aspx
Please let us know if you have any concern.
Thanks,
Karthikeyan.C