John, thank you so much... that solved several problems for me!
With those object references I was able to find a way to "save a copy as..." which I can then manipulate?
Question: there's an Application.ActivePresentation object, but if I use the .SaveCopyAs method, I get an external file copy but how would I edit the contents of that file? All the examples I see are for an active presentation.
Specifically, how would I delete a slide in that newly created copy of the master PPT by referring to a specific slide? Is it possible to create an object for a second presentation that is not active or currently opened and exists only as a file?
Also, I assume that saving as a copy also creates new unique slide IDs?