I think I found my answer. If you know different let me know.
My question was how many HE-111 P models were produced by NDW (Norddeutschen Dornier-Werken). It is my understanding production of the "P" model lasted from at least 1938/9 to 1940. It then being superseded by the "H" series.
What I found is "A total of 834 He 111P’s - the first He111 to be mass produced -
were built, mostly at the Heinkel Works in Rostock-Marienehe and in the neighbouring North
German Dornier Works in Wismar. Most of these were Heinkel He 111-P2’s."
http://manuals.hobbico.com/rvl/80-4696.pdf
I also found of those P models produced, NDW produced 20 P1, and 288 P2. see:
http://www.fliegerhorst-oldenburg.de/pdf/He%20111.pdf
Thanks!