"Standard" Access doesn't create the PDF dynamically. It creates the report first, then exports the report to the PDF convertor that is part of Access. The PDF you get this way would be static.
To do what you ask, you would have to create a report that is incomplete, trigger creation of the report with incomplete data, convert that incomplete report to a PDF, and then somehow display it. Using the simplest way, when you add another element of the report, you would have to delete the previous PDF to make a new one with a little more data than before. I won't say you can't do this but it DOES seem like it would be a real pain in the patootie and would involve a lot of file handling. When you do display it, I don't recall that you get the PDF opened in your Access window unless perhaps you created and followed a hyperlink.
If you DON'T do it that way, the PDF display becomes a separate Windows process and you might have a hard time getting rid of it. You would have to use some sort of API to do that because ordinary VBA isn't set up for external task control.
If you have the Adobe .DLL you might be able to do that kind of display control. However, from my understanding of what Adobe does, you could not do that incremental update you are describing unless you built a template of your report external to Access and use the Adobe .DLL file to manipulate it.