Svilen here, I will be glad to help out with this question!
Splitting, merging, and other manipulations of PDF files can be achieved by using the PDFStreamWriter class. I've prepared a small demo for you, where a pdf file is imported, split into pages and each page is exported as a separate file. I've attached it to this message.
You can find more useful manipulation examples such as merging PDFs in our WinForms Demo application. To navigate to the proper demo select Explore all controls > PDF processing > Merge, Split or Add Content (see attached images). You can view the code by selecting your programming language in the top right corner (also attached image).
I hope this will be useful. Should you have further questions, I would be glad to help. Have a great day!
Regards,
Svilen
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